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US 4,543,619 AGranted
Magnetic disk cartridge and disk drive
AssigneeMinnesota Mining and Manufacturing Company
InventorSheldon L. Pastor
Life of this patent
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AssigneeMinnesota Mining and Manufacturing Company
InventorSheldon L. Pastor
Estimating the term…
A protective cartridge and drive mechanism for use with a stretched surface recording (SSR) disk. The cartridge encloses the disk and includes a rotary locking mechanism which forces the disk into sealing engagement with the cartridge and an erasure preventative control lever which may be manually operated from outside the cartridge. The drive mechanism includes apparatus which releases the cartridge locking mechanism, a sensor which detects the position of the cartridge control lever and operates to prevent the erasure of material recorded on the disk, and two magnetic transducer heads diametrically spaced with respect to the disk which allow random access to recorded information and switching between information recorded at two locations on the disk without the introduction of interference or receiver screen blanking during switching.
A cartridge and disk assembly for use in combination with a disk drive mechanism, the cartridge and disk assembly comprising:
A disk drive mechanism for use in combination with a disk cartridge assembly including a shell surrounding a rotatable disk and locking means for selectively preventing movement of said disk with respect to said shell upon rotation of said locking means, which disk cartridge assembly may be inserted into said drive mechanism, said drive mechanism comprising:
Dependencies are inferred from the claim text.