# US 4,400,748 A · Flexible magnetic disk drive using a rigid cartridge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,748 A - Document ID: US4400748A - Status: Granted - Kind: A - Application number: 06/256,320 - Filed: 1981-04-22 - Granted: 1983-08-23 - Earliest claimed: 1981-04-22 - Assignees: Iomega Corporation - Inventors: Randall C. Bauck; S. Peter Kleczkowski; Anton J. Radman - Web page: https://patentgrep.com/patent/US4400748A ## CPC - G11B 17/043: Direct insertion, i.e. without external loading means - G11B 17/032: Positioning by moving the door or the cover {(G11B17/035 takes precedence)} - G11B 23/0321: {rigid cartridges for single discs} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A cartridge for a flexible magnetic disk includes a rigid box with an opening on one side which is normally closed by a slider. When the cartridge is inserted into the drive, the slider moves to the open position in which the disk can be engaged to rotate it in read/write relationship with a magnetic head. As the cartridge is inserted, a fixed Bernoulli plate in the drive enters the cartridge through an edge thereof. The disk is rotated against the Bernoulli plate to provide stability. ## Claims ### Claim 1 A magnetic disk cartridge for use with a disk drive of the type having a fixed Bernoulli plate against which a flexible magnetic disk is rotated in read/write relationship with a magnetic head, said cartridge comprising: a rigid box containing said flexible magnetic disk, said box having an opening in one side thereof through which said disk is rotated in said read/write relationship; and a slider which normally closes said opening, said slider being engaged by said plate when said cartridge is inserted into said drive to move said slider to an open position in which said disk is rotated in said read/write relationship. ### Claim 2 (depends on 1) The cartridge recited in claim 1 wherein said box has an open edge, said slider having a flat portion which normally closes said opening in one side and a ridge portion which normally closes said open edge so that said plate enters said cartridge through said open edge as said slider is engaged by said plate. ### Claim 3 (depends on 2) The cartridge recited in claim 2 wherein said ridge portion has recessed ramps which are engaged by tapered points on said plate to lift said slider out of said open edge whereby said plate can enter through said open edge. ### Claim 4 (depends on 1) The cartridge recited in claim 1 further comprising: locking means for locking said slider in the closed position, said locking means being released by said plate when said cartridge is inserted into said drive. ### Claim 5 (depends on 4) The cartridge recited in claim 4 wherein said locking mechanism includes detents on each side of said slider which engage locking recesses on said box, inside the side edges, said detents being engaged by ramps on the side of said plate to move said detents out of said locking recesses. ### Claim 6 (depends on 5) The cartridge recited in claim 5 wherein each detent includes an arrow shaped member with an outside ledge which engages a locking recess and an inside ledge which engages a tab on said plate when said outside ledge is not in said locking recess, so that said slider is moved to a closed position when said cartridge is removed from said drive and so that said cartridge cannot be removed from said drive unless said detents are in the locked position. ### Claim 7 (depends on 1) The cartridge recited in claim 1 wherein said flexible magnetic disk has a hub, said cartridge having a hub recess in which said hub is positioned. ### Claim 8 (depends on 7) The cartridge recited in claim 7 wherein said slider has a protrusion on the inside of a flat portion thereof, said protrusion retaining said hub in said hub recess when said slider is in the closed position. ### Claim 9 (depends on 1) The cartridge recited in claim 1 wherein said cartridge has internal grooves along the side edges of said box to guide said cartridge along the side of said plate as said cartridge is inserted into said drive. ### Claim 10 (depends on 1) The cartridge recited in claim 1 further comprising: external guide grooves along two edges of said cartridge, said grooves engaging guide tracks in said drive to ensure proper orientation of said cartridge when it is inserted into said drive. ### Claim 11 A magnetic disk drive of the type which reads and writes magnetically recorded information from a magnetic disk contained in a cartridge comprising: a Bernoulli plate fixed in said drive with an edge thereof in proximity to an opening in said drive through which said cartridge is inserted so that said edge of said plate enters said cartridge through an edge thereof to position said flexible disk against said plate; a magnetic head; and means for rotating said disk against said plate in read/write relationship with said magnetic head. ### Claim 12 The combination of a magnetic disk drive and a disk cartridge comprising: a rigid box forming said cartridge; a flexible magnetic disk enclosed in said box; a Bernoulli plate fixed in said drive with an edge thereof in proximity to an opening in said drive through which said cartridge is inserted so that said edge of said plate enters said cartridge through an edge of said cartridge, said flexible magnetic disk being positioned against said plate; a magnetic head; and means for rotating said disk against said plate in read/write relationship with said magnetic head. ### Claim 13 (depends on 12) The combination recited in claim 12 further comprising: locking means for locking said slider in the closed position, said locking means being released by said plate when said cartridge is inserted into said drive. ### Claim 14 (depends on 12) The combination recited in claim 12 wherein said cartridge further comprises: a slider which normally closes an opening in said cartridge, said slider being engaged by said plate when said cartridge is inserted into said drive to move said slider to an open position in which said disk is rotated in said read/write relationship. ### Claim 15 (depends on 14) The combination recited in claim 14 wherein said opening in said cartridge includes an open side and an open edge in said box, said slider having a flat portion which normally closes said open side and a ridge portion which normally closes said open edge so that said plate enters said cartridge through said open edge as said slider is engaged by said plate. ### Claim 16 (depends on 12) The combination recited in claim 12 wherein said cartridge has internal grooves along the side edges of said box to guide said cartridge along the sides of said plate as said cartridge is inserted into said drive. ### Claim 17 (depends on 12) The combination recited in claim 12 wherein said drive has guide tracks extending from the opening in said drive through which said cartridge is inserted; and external guide grooves along two edges of said cartridge, said grooves engaging said guide tracks to ensure proper orientation of said cartridge when it is inserted into said drive.