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Apple 3.5 Drive; Apple SuperDrive ... Apple Widget; Macintosh Hard Disk 20; Apple Hard Disk 20SC; Xserve RAID; Time Capsule; Optical drives. AppleCD; PowerCD ...
The Macintosh Hard Disk 20 is the first hard drive developed by Apple Computer specifically for use with the Macintosh 512K.Introduced on September 17, 1985, it was part of Apple's solution toward completing the Macintosh Office (a suite of integrated business hardware & software) announced in January 1985.
The 20SC originally contained a half height 5.25" Seagate ST-225N 20MB SCSI hard drive, but was later manufactured with a full-height 3.5" MiniScribe 8425SA 20MB SCSI hard drive. The latter drive was the same size as the drive inside the Macintosh Hard Disk 20, but 10 to 15 MB over what had previously been offered by Apple for the II family.
The Macintosh can only support one external drive, limiting the number of floppy disks mounted at once to two, but both Apple and third party manufacturers developed external hard drives that connected to the Mac's floppy disk port, which had pass-through ports to accommodate daisy-chaining the external disk drive. Apple's Hard Disk 20 can ...
A stock Mac 128K with the original 64K ROM is incompatible with either Apple's external 800 KB drive with the Hierarchical File System or Apple's Hard Disk 20. A Mac 128K that has been upgraded with the newer 128 KB ROM (called a Macintosh 128Ke) can use internal and external 800 KB drives with HFS, as well as the HD20.
Fusion Drive remains available in subsequent models of these computers, but was not expanded to other Apple devices: the latest MacBook and Mac Pro models use exclusively flash storage, and while this was an optional upgrade for the mid-2012 non-Retina MacBook Pro discontinued by Apple, it replaced the standard hard disk drive in October 2021 ...
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