Hard Disk 20SC
Model Number: M2604
|
|
| Connects to |
Macintosh Plus;
Apple IIe;
|
|---|---|
| Design firm | Apple Inc. |
| Manufacturer | Apple Inc. |
| Introduced | September 1986 |
| Discontinued | 1989 |
| Cost | US$1,299 (equivalent to $2,838 in 2016) |
| Type | Hard Disk |
| Memory | 20 MB |
| Connection | Direct |
| Ports | SCSI DB-25 x2 |
| Power consumption | 30 W |
| Weight | 9 lbs (4 kg) |
| Dimensions | 3.1 x 9.7 x 10.5 (inches) 78.5 x 246 x 266 (mm) |
Macintosh Plus;
Macintosh SE;
Macintosh II via:
Apple IIe;
Apple 2GS via:
The Apple Hard Disk 20SC (not to be confused with the Apple Macintosh Hard Disk 20, the first hard drive manufactured by Apple Computer exclusively for the original Macintosh floppy disk drive port interface) is Apple's first SCSI based hard drive for the Apple II family as well as the Macintosh and other third party computers using an industry standard SCSI interface.
Released in September 1986 along with the Apple IIGS (which required an optional SCSI interface card to use it), it debuted over 9 months after the introduction of the Macintosh Plus, the first to include Apple's SCSI interface. It was a welcome addition, delivering considerably faster data transfer rates (up to 1.25 megabytes per second) than its predecessors, the Hard Disk 20 (62.5 Kilobytes per second) and ProFile.
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 same drive mechanism would also be offered 6 months later as a built-in drive option on the Macintosh II and SE. It had two standard Centronics 50-pin connectors, one for the System and one for daisy-chaining additional SCSI devices and a SCSI ID selection switch. An external terminator was required if it was the only SCSI device connected. The case itself could accommodate a 3.5" or 5.25" full-height hard drive mechanism. Indeed, the case design would be reused unchanged (in Platinum only) for 3 more models introduced the following year: 40SC, 80SC & 160SC (offering respective Megabytes of storage). While the transfer rates were significantly higher due to the faster SCSI bus technology, the actual transfer rate varied from computer to computer thanks to different SCSI implementation based on developing industry standards.
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