DE3038459A1 - DISC DRIVE - Google Patents

Description

Q33459

DESCRIPTION

The invention relates to disk drive storage systems for digital computers.

Rotating magnetic data storage media have been known in computer systems for over 25 years. Rotating fixed as well as removable hard diskettes with magnetic surfaces are used for storing and reading out data. Disk drives have a magnetic read / write head mounted on a movable arm which positions the head over a selected concentric track. Recent developments relate to removable flexible floppy disks made from a magnetically coated circular floppy disk made of Mylar or other flexible materials approximately 8 inches in diameter. Systems with such flexible floppy disks are more compact and have a lower cost per drive as a result than is the case with the previously used hard floppy disks. One of the latest developments in magnetic storage means represents the development of flexible mini disk containing a magnetically coated flexible circular plastic disc which lies within a rigid shell r the cut-outs for access to the magnetic medium has. Such mini disks have an outer diameter

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of about 13.3 cm. Although this storage means is a further improvement in compactness and another A reduction in the cost per disk drive is the cost per bit stored relatively large, and this is due to the fact that only a single mini-disk from a mini-disk drive is driven »Furthermore, the storage density of mini disks is due to the fact limited that the number of concentric tracks, i.e. the track density, is limited. This restriction arises from the possibility of error in the facilities for searching for the selected tracks lies. Since the mini disks are interchangeable or detachable, the weight must be used for the head pressure to contact the surface of the mini floppy disk with the magnetic read / write head Distance from the floppy disk must be attached so that the floppy disk is inserted without interference and can be taken out. This distance between the pressure element and the disk has a significant increase in head placement time with a corresponding increase in the mean search time required to find a search for the selected track. The currently available drives for flexible mini disks are therefore the storage capacity and the speed of the track search are very limited.

The object of the invention is therefore to develop a drive for mini disks in such a way that the mentioned disadvantages are eliminated.

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To solve this problem, the invention provides a magnetic storage system in which a. rotating element has a track with a circular component running around an axis and a translation component running perpendicular to the circular component, the two components together defining a pitch or pitch. The slope of the track has alternating ramps and transition zones; the slope of the transition zones is steeper than that of the ramps; the element is rotatably driven about said axis; a magnetic head holder includes a follower which engages the track so that the head holder translates parallel to the translational component as the element rotates; A magnetic transducer head is attached to the head holder; a magnetic storage medium is moved past the head at right angles to the translation component. The medium has a magnetic surface parallel to the translational component. The magnetic surface has data tracks across the translation component, the positions of which correspond to the ramps. The magnetic storage medium i ^si - preferably a floppy disk; the rotatable element is preferably a lead screw or screw spindle and the track has a helical shape.

According to one embodiment of the invention, a Drive for magnetic disks provided, which has a housing with a disk receiving gap, a Disk drive spindle in the housing adjacent to the gap, a holder for positioning the

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Floppy disk inserted into the slot on the spindle contains to the disk in a floppy disk level to lay. A first and a second element are also provided, which are mutually opposite The sides of the disk plane in the housing are aligned. The first element is perpendicular to the disk plane movable between a rest position and a position in the disk plane, and the second Element is stationary. At least one of these elements is a magnetic head. The first element will moved from the rest position to an intermediate position that is closer to the disk plane than the rest position, and this movement preferably takes place with the contact engagement of the disk holder. In response to a floppy disk access command, the first element is then out of the intermediate position moved to position within the disk plane to put a disk on the spindle between the first and to clamp the second element and store or read out magnetically stored information to enable.

According to a further embodiment of the invention a drive for two magnetic floppy disks is proposed. On a chassis is a first and a second spindle arranged to rotate independently of one another about aligned axes can. The motor has a shaft that rotates around an axis that is not parallel to the spindle axes is. A direction reversing wheel is arranged on the base plate and rotates around one to the Spindle axis non-parallel axis; an endless belt runs along a path around the shaft of the motor, the pulley and the first and second spindle to

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to drive the spindles in opposite directions.

According to a further embodiment of the invention a drive for two magnetic diskettes is specified, in which a first and a second spindle on one Base plate are arranged and are independently rotatable about aligned axes. Magnetic transducer heads collar from the ends of a magnetic head transport block against the spindles and allow the Heads can approach the spindle axes closer than the block. The spindles have adjacent one another Belt guide sections with a relatively large diameter and facing away from each other Ends of smaller diameter disk contact or holding portions. The magnetic head transport block is relative to the spindle axes in the radial direction along the disk planes with the belt guide sections can be moved in alignment. The magnetic heads are in a plane with the diskette holding sections.

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Advantageous further developments of the invention are characterized by the features of the subclaims.

In the following, exemplary embodiments of the invention are explained in more detail with reference to the drawing. Show it:

Figure 1 is a front view of a mini disk drive for two disks according to the invention;

1A is a perspective view of the mini disk drive with removed front window;

FIG. 2 is a partial perspective view of FIG

Means for driving the floppy disks in opposite directions;

Figure 3 is a side view of the dual mini disk drive;

Fig. 4 is a side view of the magnetic

Read / write head and associated disk in open position;

Figure 5 is a side view of the magnetic read / write head and associated one Plate in closed position;

Fig. 6 is a perspective view of the invention Attachment device for the magnetic read / write head;

Figure 7 is a view taken along line 7-7 of Figure 3;

a perspective view of the lead screw on a disk drive;

a detail of the thread of the lead screw; and

a schematic view of part of the lead screw

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Fxg. 7th Fig. 8th Fig. 9 Fig. 10

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1, 1A, 2 and 3, a double drive 10 for flexible mini-disks according to the invention is shown. The drive has a base plate or chassis ^ 6 with a first side wall 13 and a second side wall 14, both of which have the same dimensions and are perpendicular to the base plate. The height H of the side wall and the width W of the base plate correspond to the manufacturer's standard dimensions for a single drive of a mini diskette; the height H is 8.25 - 0.02 cm, and the width W is 14.60 + 0,0O _7, - 0.05 cm. The two side walls have a pair of guides 91 and 92 for positioning minidiscs that have been received.

A front window 17 is attached to one of the base plates, the plane of the front window runs approximately perpendicular to the plane of the base plate. The front window 17 has a first gap 18 and a second Gap 19 in planes parallel to the base plate for the optional accommodation of insertable mini diskettes 42. The recorded mini disks are also in planes that run parallel to the plane of the base plate. A first spindle 21 and a second spindle 22 are each arranged on one side of the base plate and are rotatably mounted independently of one another on a shaft 25 by means of an interference fit sits in the base plate. The spindles are thus aligned on an axis that is transverse to the plane of the base plate runs. A movable plate 23 and a second one movable plate 24 are attached to base plate supports 26 and 27, which supports are attached to the Front window opposite end of the base plate are arranged. The plates 23 and 24 are pivotable

ORIGINAL INSPECTED

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bar attached to the supports by means of flat springs 28 and 29, which the plates 23 and 24 from the Plane of the base plate 16 away, i.e. push away from each other.

A mini disk 42 has a central opening, the peripheral edge optionally by means of a first rotatable disk holder 33 or a second rotatable disk holder 34 on the first Spindle 21 or the second spindle 22 is attached. The disk holder 33, 34 are on the movable Plates 23, 24 attached and have a circumference that is elastic due to incorporated slots is compressible. At the ends of the movable plates 23, 24 are a first door 31 and a second door, respectively rotatably coupled. These doors are pivotally attached by means of a pin 30 which is the end of the Plates 23 and 24 coupled to lugs 35 which protrude from the surface of the doors. When inserting a mini floppy disk is clamped onto its respective spindle by the user, the end of the door protruding from the front window level being lifted and at the same time in a concluding with the front window Position is rotated. This will lock the disk in place and turn the mini disk into a clamped in a fixed position, which causes a frictional connection of the mini disk to its respective spindle. The mini-disk is removed in that the door in question is approximately perpendicular to the plane of the Front window is rotated, whereby it is possible for the flat springs 28, 29, the panels 23, move away from the plane of the base plate so that

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the included mini disks can be removed. When the door moves from a position parallel to the corresponding movable plate, i.e. from its open position into a plane perpendicular to the corresponding movable platen, i.e. is moved into the closed position, the movable platen is against the base plate 'swung down and the disk holder engages in the disk.

To drive the spindles in both directions, a motor 36 is on the base plate between the Columns 18 and 19 arranged adjacent to the spindle 21 and 22; the shaft 37 of the motor has an axis of rotation, which is substantially perpendicular to the axis of the spindles. A drive wheel 38 is on the Shaft of the motor 36 attached. Near the other end of the motor there is a rotatable,

Directional steering wheel '39 is provided, whose The axis of rotation lies in the same plane as the axis of rotation of the shaft 37. An endless belt 41 runs over the Drive wheel 38, the second spindle 22, the direction reversing wheel 39, and around the first spindle 21. The direction the belt is reversed by the drive wheel and the directional pulley, so that the first spindle and the second spindle is driven in opposite directions. The one at the first and the Floppy disks clamped to the second spindle therefore rotate in opposite directions.

Magnetic read / write heads 63 and 64 are back to back between the planes of the gaps 18, 19 so positioned, compare. The heads 63, 64 that the on

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the spindles 21 and 22 of the clamped mini-disks rotate in the same direction, i.e. clockwise. The two mini-disks can be read and written in the same way, e.g. by the same electronic Circuit, as the floppy disks move past the heads relative to the Move heads in the same direction.

In Fig. 3, the mini disk 42 is clamped onto the first spindle 21 by means of the first disk holder 33; the plate 23 is in the "closed" position. While the plate 23 in the closed Position goes, the holder 33 moves into the central opening of the mini disk with frictional connection and presses the circumference of the holder 33 together and centers the mini disk on the holder 33. If the Plate 23 is in the closed position, the end of the holder 33 lies within the central Opening of the spindle 21. The faces of the mini disk are clamped between the surfaces of the holder 33 and the spindle 21 parallel to these surfaces. The second plate 24 is shown in the "open" position. If the plate 23 or 24 is in the closed position, these plates are parallel to the plane of the base plate 16 aligned. In the open position, the plates 23 or 24 are separated from the one running parallel to the base plate 16 Position pushed away under the pressure of springs 28 and 29, respectively.

A first reference plane 44 and a second reference plane 46 are established by means of the holders 47 and 48 attached to the base plate 16. The reference-

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i levels are used to store the flexible floppy disks in a *

Keep plane parallel to the axis of radial displacement of the magnetic heads.

In FIGS. 4, 5, 6 and 7, the head attachment device according to the invention is shown. Fig. 6 shows a perspective view of the essential elements of the Kopfaufsetzvorr ^ ichtung in connection with the first spindle 21. Corresponding elements which the associated with the second spindle 22 are essentially identical; the description is therefore only given in Connection made with the first spindle. A solenoid 52 is attached to the base plate 16. A lifting arm 53 is attached to an armature 50, one end of which is pivotally attached to the solenoid is; the lift arm is raised by a spring 54 against a set screw 62 on the plate 23, pushed away from the plane of the base plate 16. A Head loading arm 56 is pivotable by means of a Bolt 57 attached to a head carriage, which will be explained in more detail. A spring 58 is pressed Pressure pad 59 on arm 56 against the plane of base plate 16. When solenoid 52 is not energized, The spring 58 presses the arm 56 against the lifting arm 53, which is a predetermined by the adjusting screw 52 Distance from the plate 23 is spaced apart. On the ends of corresponding head holders 65 and 75, the attached to a lead screw follower block 66 is a first magnetic read / write head 63 and a second read / write head 64 are arranged. The heads 63 and 64, the head holders 65 and 75, and the block 66 form a head carriage, which parallel to the plane of the inserted mini disk in the radial direction relative to the axis of the spindle 21

ORIGINAL INSPECTED 130017/0824

and 22 on carriage rails 67 (Fig. 7) which are anchored to the base plate. The carriage rails 67 run through corresponding aisles (not shown) in the block 66 or through a separate part attached thereto. The heads 63 and 64 protrude at the end of the block 66 by means of the holders 65 and 75 adjacent to the spindles 21 and 22, in alignment with the the disk contacting portions of the spindles, see Fig. 3. The dashed line 66 in Fig. 7 denotes the end of the block adjacent to the spindles 21 and 22, which is aligned with the parts of the spindle which guide the endless belt. Therefore, although the radial movement of the block 66 towards the axis of the spindles is limited because of the large diameter of the belt-guiding portions of the spindles 21, 22, see FIGS. 2 and 7, the heads 63 and 64 can be tighter because of the overhanging construction approach the spindle axis as block 66; in this way the heads 63 and 64 have access to the entire data storage area of the floppy disks. : '. '.. ^v

In an alternative embodiment of the invention the pressing members 59 and 61 are actuated by third and fourth magnetic read / write heads, respectively replaced. These additional heads enable the information to be recorded and read out from flipping both sides of a mini disk without the need to take out the mini disk and slide it back into the drive.

In Fig. 4 the plate 23 is shown in the open position. The pressure element 59 is pressed away from the plane of the base plate 16 by the spring 54,

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for easy insertion and removal of the To enable mini disk 42 without touching the pressure element 59 or the read / write head 63. Fig. 5 shows the plate 23 in the closed position, in which the pressure element 59 of the surface of the Mini disk 42 is closely adjacent.

In the open position, the plate 23 is urged away from the plane of the base plate 16 by the force of the springs 28 which secure the plate to the slots 26; The lifting arm 53, under the action of the magnetic coil spring 54, lifts the loading arm 56 away from the plane of the base plate and thus overcomes the smaller counterforce of the spring 58. In the closed position, the plate 23 is moved against the plane of the base plate and is thereby fixed in this position by the user _r that the door 31 is rotated into a position flush with the front window 17. While the plate is being moved into the closed position, this movement is transmitted to the lifting arm 53 by the set screw 62. As a result, both the loading arm 56 and the lifting arm 53 are moved against the plane of the base plate, whereby the loading arm brings the pressure element attached to it into a position closely spaced from the inserted mini disk. When the mini-disk is clamped onto its respective spindle because the disk is moved to its closed position, the gap between the head and the mini-disk is kept to a minimum by adjusting the set screw 62. On command, the coil 52 is energized and pulls the armature 50 into the coil, causing the lifting arm 53 in still

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closer proximity to the level of the recorded minidisk than this is brought by Plate 23 and adjusting screw 62 defined position is the case. This repositioning possible on command enables the loading arm 56 to exert the force of the spring 58 via the pressure element 59 the surface 79 of the mini-floppy disk to transfer that of the surface adjacent to the read / write head 63 81 opposite. Therefore, upon such a command, the read / write head 63 contacts the surface 81 of the mini floppy disk and in this way enables either reading in or reading out of magnetic information.

Since the plate 23 presses the pressure element 59 when the door 31 is closed at a very small distance from the mini disk the waiting time between the head loading command to the coil and the actual loading becomes of the pressure element is greatly reduced. Because of this reduced waiting time, there is a longer waiting time Track search speed, as the delay when pressing the head is reduced to a minimum. Since the gap 82 is also reduced according to the invention is, the pressing member 59 touches the surface of the mini disk 79 with less force, whereby the impact and head setting time is reduced.

In Figs. 7, 8 and 10 parts of the track search device are shown. Is on the base plate 16 a stepper motor 68 attached, the axis of rotation of which is perpendicular to the axis of rotation of the first and second Spindle 21, 22 is. The shaft 69 of the stepping motor is attached to a guide tube 71 which

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has a helical track e.g. in the form of a V-groove 72. The stepper motor turns on command the shaft 69 and the guide screw 71 in equal increments. The head carriage 66 has a first one magnetic read / write head 63 and a second magnetic read / write head 64 which are coaxial so are arranged so that the heads are aligned along an axis which is substantially parallel to the axis of spindles 21 and 22 is. The head carriage is arranged between the levels of the column 18 and 19, the heads are mounted back-to-back in the head cart and face the adjacent surface of the mini-disks that pass through the two gaps are inserted, and the heads are used to record and read out information. The head carriage is aligned radially with respect to the axis of the mini-disks to reproducibly over selected heads Position traces of the mini disks. A follower element such as a ball 78 (Fig. 3) is Attached to the lead screw follower block 66 by means of a flat spring 70 or the like To connect the head carriage with the guide screw 71. The lead screw has a helical shape V-groove 72 to position the head carriage radially. The ball 78 is spring-loaded by means of the spring 70 and runs in the V-groove 72 while the lead screw rotates. While the stepper motor is rotating, lead the shaft and the guide screw a repositioning of the head carriage in the radial direction by. The head carriage slides freely along the. Carriage rails 67 so that movement of the head carriage is limited along an axis which is radial to the floppy disks, and the movement of the Head carriage takes place depending on the direction of rotation of the step

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motors in both directions of this axis; this way any concentric track on the Surface of the mini floppy disks can be selected.

FIGS. 8 and 9 show details of the lead screw 71 of a mini disk double drive. Fig. 8 is a perspective view of the lead screw 71 having a helical V-groove 72 owns on its surface. In a preferred embodiment of the invention, the cross-sectional profile has the V-groove an angle of about 70 Fig. 9 shows part of the V-groove 72 in detail.

The helical V-groove consists alternately of rest zones 73 and transition zones 74 of different types Slope, the value of which depends on various factors such as B. the maximum angle error of the stepper motor, the desired track density, the inertial mass of the head carriage assembly, and the diameter of the Guide screw depends. The positions of the quiet zones 73 correspond to the tracks on the disc, and the transition zones 74 correspond to the distance between the tracks. The quiet areas have preferred a slope with the value zero, i.e. they lie in a plane that is perpendicular to the screw axis runs. However, if the distance between the tracks is too great, the quiet zones must have a slope different from zero, but which should still be smaller than the slope of the transition zones to an undesirable Prevent oscillation of the lead screw follower 78. For the following example For example, it is assumed that the slope of the quiet zones is greater than zero, i.e. that the quiet zones

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be in the form of ramps.

The ramps are defined by two orthogonal components. An axial or translational component parallel to the axis of rotation 76 of the guide screw 71, and a circumferential or circular component 86 perpendicular to the axis of rotation of the lead screw. The translation component 84 indicates the total permissible misalignment of the head with respect to the selected track. As this component decreases, the angle 77 of the ramp reaches the value 90 °. the Acceleration of the head carriage 66 from a transition zone 74 to a ramp 73 increases with increasing Angle 77 also closes. With increasing acceleration, however, the follower element 78 can become an undesired one Perform oscillation within the V-groove. The translation component 84 of the ramp 73 is parallel the axis of rotation 76 is therefore chosen to be as small as possible / it preferably has the value zero the oscillation of the lead screw follower to bring it to a minimum value. In one embodiment of the invention, the translation component is 84 approximately 0.003 cm for a tracking error of about - 0.015 cm. The angle 77 is about 83 in this embodiment. the Circumferential component 86 perpendicular to the axis of rotation 76 corresponds to the chord length 86, which is in a Beam angle 87 results, which is approximately equal to twice the maximum angle error of the stepper motor. The beam angle 87 is that angle which is projected onto a plane perpendicular to the axis of rotation of the lead screw, the apex of the Angle coincides with the axis of rotation of the screw. In one embodiment of the invention

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the jet angle 87 is about 2 ° and the radius of the guide screw is about 1.15 cm. The resulting Chord length 86 is then about 0.02 cm.

The transition zones 74 alternate with the ramps 73 and connect the ramps, and have an axial component 83 parallel to the axis of rotation of the lead screw 76, which is approximately equal to the distance between the tracks of the floppy disk is. In one embodiment of the invention, component 83 is about 0.025 cm. According to FIG. 9, the slope of the transition zones is steeper than the slope of the ramps 73. A preferred one Embodiment of the invention has transition zones with continuously changing slope, the slope in the middle of the zone is greater than at the ends, so that the follower element is at Approaching the ramps slows down. The head carriage 6 6 then makes a smooth transition between adjacent ones Ramps and minimizes the acceleration in the vicinity of the ramps.

The use of different slopes enables a more precise alignment between the head and Track when positioning the head carriage 66 than would be possible with a constant incline, and they allow faster positioning of the head carriage 66, so that shorter access times to the data on the disks than would be the case with a constant slope.

While the stepper motor continues to turn incrementally from one rest position to the next, is the ball 78 in the ramps 73 when the

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Motor is at rest, and ball 78 is in the transition zones when the motor is off the one rest position rotates to the other position. The peripheral component of the transition zones 74 corresponds to one or more angle increments of the Stepper motor.

Instead of the described embodiments In accordance with the invention, the track on the guide screw can also be raised instead of a groove. In In this case, the following element must be suitably adapted to the raised track. Furthermore, the track search device and the head pressure device can also be used with a one-disk drive, which is arranged in a known manner. The process of rotating the floppy disks in opposite directions to Reading or storing information from adjacent surfaces can be done in data storage systems Which flexible floppy disks or fixed or interchangeable hard disks with process with a diameter of 20.3 cm. The advantage of a more compact drive and use only one motor can be implemented in all of the alternative embodiments mentioned. aside from that may provide the means for reducing the head press delay in a variety of storage systems can be used with insertable media, with other storage media in addition to mini diskettes Storage media can be used. The invention can also be used in systems that Magnetic heads on either side of a floppy disk or mini disk own to both. Pages of memory

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The medium can be scanned without having to remove the storage medium and turn it around.

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Claims (15)

DIGITAL EQUIPMENT CORPORATION, incorporated under the laws of the State of Massachusetts, V.St.A. 146 Main Street, Maynard , Massachusetts 01754 V.St.A. Disc drive EXPECTATIONS ( 1J disk drive, characterized in that a rotatable element (71) is provided with a track (72) which has a circumferential component around an axis, and a translation component perpendicular to the circumferential component and defines a slope, the slope of the track has alternating ramps (73) and transition zones (74) and the slope of the transition zones (74) is steeper than that of the ramps (71), that means (68, 69) are provided for driving the rotatable element about this axis, that a magnetic head holder (65, 66) contains means (78) for following the track (72), WWR / eo 130017/0824 ORIGINAL! 5-4SFSCTED 3038453 so that the head holder (65, 66) is parallel to the translation component is displaceable while the rotating element (71) rotates, that a magnetic transducer head (63) is arranged on the head holder (65, '66), and that means (21, 22, 36 to 41) are provided to move a magnetic storage medium past the head across the translational component move so that the storage medium has a magnetic surface parallel to the translation component, that the magnetic surface has information tracks transverse to the translation component, the correspond to the ramps in terms of their position. 2. Disk drive, with a spindle rotatably mounted around an axis for receiving a disk, characterized in that a guide screw (71) has a generally helical track (72) that means (68,69) are provided to guide the To rotate the lead screw about an axis perpendicular to the spindle axis, that a lead screw follower element (78) is provided and runs in the track (72) and when the lead screw is turned a Translational movement radially to the spindle axis performs that means for mounting the head on the Follower element (66, 78) are provided that the track (72) alternating ramps (73) and transition zones (74 and that the slope of the transition zones (74) is steeper than that of the ramps (73). 3. Drive according to claim 2, characterized in that the transition zones (74) are continuous have changing slope and are steeper in their middle area than at the ends. 130017/0824 4. Drive according to claim 2 or 3, characterized in that the drive means comprises a motor (68) included, which is coupled to the lead screw (71) and rotates the lead screw offset. 5. Drive according to claim 4, wherein a certain head alignment error occurs when the Motor has a given angular error, characterized in that the circumferential component of each Ramp (73) is approximately equal to twice the angle error of the motor, and that the axial component of each Ramp (73) is approximately equal to the determined head alignment error. 6. Drive according to claim 2, characterized in that the drive means is a stepping motor (68) included, the guide screw (71) incrementally from one rest position to the next rest position rotates, and that the track follower (78) is in the ramps (73) when the motor is stopped, and is in the transition zones, if the motor continues to turn from one rest position to the next. 7. Disk drive, with a housing with a disk receiving gap, a drive spindle within the housing adjacent to the gap Driving the floppy disks, and with clamping element ^ for clamping a fed through the gap Disk on the spindle, in a disk plane, characterized in that a first and a second element (59, 63) in alignment with one another on opposite sides of the disk plane 130017/0824 are arranged within the housing that the first element transversely to the disk plane between a Rest position, which is spaced from the disk plane, and a position in the disk plane movable and that the second element (63) is stationary that at least one of the elements (63) is a . , * -..-, "Means of movement. Magnetic head xst that first / are provided to the first element (59) from the rest position in a Bringing an intermediate position that is closer to the disk plane than the rest position, and that second Means (52,53) to a diskette access command respond and the first element (59) from the intermediate position in the lying in the disk plane Move position to clamp a floppy disk on the spindle and between the first and the second element (59, 63) to lead to a recording and reading of magnetically stored Enable data. 8. Drive according to claim 7, characterized in that that the first moving means for moving the first element (59) from the holding means (23, 62, 53) is controllable. 9. Drive according to claim 8, characterized in that a door (31) for opening and closing the Disk input gap is provided and that the holding means (23) and the first moving means · both are controlled by closing the door (31). 10. Drive for memory disks for storing magnetically encoded information, marked 130017/0824 1038459 by a base plate (16), a first and a second spindle (21, 22) on the base plate (16), which rotate independently of one another around aligned axes do not rotate a motor (3 6) on the base plate (16) of its shaft around one with the spindle axes parallel axis is rotatable, a direction reversing wheel (39) on the base plate (16) for rotation an axis which is not parallel to the spindle axes, and an endless belt (41) which .sich around the motor shaft (37, 38), the deflection wheel (39), the first and the second spindle (21, 22) and the spindles rotated in opposite directions, and holding means (23, 33, 24, 34) for clamping the Memory disks on the spindles (21, 22). 11. Drive according to claim 10, characterized in that the base plate (16) is a base plate contains between the spindles (21, 22) on which the direction reversing wheel (39), the motor (36) and the Spindles (21, 22) are arranged that the motor (36) along the base plate transversely to the spindle axes extends that the motor shaft 'lies on one side of the motor between the spindles, and that the deflection wheel (39) is on the other side of the motor between the spindles. 12. Drive according to claim 11, characterized in that the spindles (21, 22) are adjacent to one another Larger diameter belt guide sections and disk contacting sections at opposite ends smaller diameter that a magnetic head transport block (66, 67) 130017/0824 radially to the spindle axes - in alignment with the belt guide sections - is displaceable that a first and a second magnetic transducer head (63, 64) is provided that the magnetic head holder (65) holds the magnetic heads (63, 64) over the end of the transport block (66) against the spindles (21, 22) so that the heads (63, 64) with the disk contact portions aligned closer to the spindle axes than the transport block. 13. Drive according to claim 10, characterized in that the spindles (21, 22) each have a central opening have that the holding means (34) each have a clamp which is inserted into the center openings of the corresponding Spindles is insertable. 14. Drive for storage disks that are magnetic store encoded information with a chassis, first and second spindles on the chassis for an independent rotation around the aligned Axles, characterized in that the spindles (21, 22) have adjacent belt guide sections larger diameter and smaller diameter disk contacting portions at opposite ends have that drive means (36) are provided for driving the spindles, that a magnetic head -Transport block (66, 67) radial to the spindle axes, with the belt guide sections is aligned, displaceable that a first and a second magnetic transducer head (63, 64) is provided, that head holder (65) are provided which the Keep magnetic heads (63, 64) protruding beyond the end of the block (66) and directed towards the spindles, 130017/0824 3Q38459 to bring the heads closer to the spindle axes, in alignment with the floppy disk contact portions to be able to as the block, and that holding means (33) for clamping the storage disks on the Spindles are provided. 15. Drive according to claim 1, characterized in that that the drive means includes a stepping motor (68) incrementally driving the rotatable element (71) moves from a rest position to a next rest position, and that the track follower (78) is in the ramps (73) is when the motor is stopped and that the track follower (78) is in the transition zones is when the motor rotates from one rest position to another rest position. 1 30017/0824