Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K for Sale

Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K For Sale

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Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K:
$330.60

Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K or 512K
In beautiful condition,Tested and working fine
The following info is from Wikipedia
The original Macintosh External Disk Drive (M0130) was introduced with the Macintosh on January 24, 1984. However, it did not actually ship until May 4, 1984, sixty days after Apple had promised it to dealers. Bill Fernandez was the project manager who oversaw the design and production of the drive.[1] The drive case was designed to match the Macintosh and included the same 400K drive (a Sony-made 3 1⁄2" single-sided mechanism) installed inside the Macintosh. Although very similar to the 400K drive which newly replaced Apple's ill-fated Twiggy drive in the Lisa, there were subtle differences relating mainly to the eject mechanism. However, confusingly all of these drives were labelled identically. The Macintosh could 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 could accommodate an additional daisy-chained hard drive as well as an external floppy disk.
3.5" single-sided floppies had been used on several microcomputers and synthesizers in the early 1980s, including the Hewlett Packard 150 and various MSX computers. The standard on all of these was MFM with 80 tracks and 9 sectors per track, giving 360k per disk. However, Apple's custom interface used GCR (Group Coded Recording) and a unique format which put fewer sectors on the smaller inner tracks and more sectors on the wider outer tracks of the disk. The disk would speed up when accessing the inner tracks and slow down when accessing the outer ones. This allowed more space per disk (400k) and also improved reliability by reducing the number of sectors on the inner tracks which had less physical media to allocate to each sector.
The external 400k Macintosh drive will work on any Macintosh that does not have a high density SuperDrive controller (due to electrical changes with the interface), but the disks in practice only support the MFS file system. Although a 400k disk may be formatted with HFS, it cannot be booted from, nor is it readable in a Mac 128/512.
Copy protection schemes were not as elaborate or widespread on Macintosh software as they were on Apple II software for several reasons. First, the Mac drives did not afford the same degree of low-level control. Also Apple did not publish source listings for the Mac OS ROMs as they did with the Apple II. Finally, the Mac OS routines were considerably more complex and disk access had to be synchronized with the mouse and keyboard.

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Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K For Sale

Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K: $330.60

Apple Macintosh M0130 External 400k Floppy Disk Drive for vintage Mac 128K, 512K:
$330.60