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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 ...
The Hard Disk 20 (or HD20, as it was known colloquially) contains a 20 MB 3.5" Rodime hard disk which provides over 50 times the data storage of the stock 400 kB disk drive. At the time when the average file size was around 10-20 kB and due to the vast number of those files the HD20 can contain, Apple's original Macintosh File System , which ...
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.
SanDisk Professional sells their external storage devices only to professionals under the product lines G-SPEED, G-RAID, G-SAFE, and G-DRIVE.. G-RAID is a line of portable external hard drive products used for field editing and backup for video producers and camera operators.
The drive was still completely incompatible with PC drives. The 800 KB drive has two read/write heads, enabling it to simultaneously use both sides of the floppy disk and thereby double storage capacity. Like the 400 KB drive before it, a companion Macintosh 800K External Drive was an available option. However, with the increased disk storage ...
An external floppy disk drive can be added using a proprietary connector (19-pin D-sub). The keyboard used a simple proprietary protocol, allowing some third-party upgrades. The mouse used standard quadrature signals for X and Y, and the single mouse button used a single wire (all signals were compatible with TTL and referenced to ground).