The Commodore 1551 was a floppy disk drive for the Commodore Plus/4 home computer. It resembled a charcoal-colored Commodore 1541 and plugged into the cartridge port, providing faster access than the C64/1541 combination.
Aside from faster access, the drive was very similar to the 1541. Like the 1541, it was a single-sided 166 kilobyte drive for 5¼" disks, with each disk split into 664 256-byte 'blocks'; the file system made each block its own cluster. Punching a second hole in the other side of the disk and flipping it over was a common practice.
Due to the Plus/4's poor sales in the United States, the 1551 is much less common than other Commodore disk drives. Also, due to its higher availability, many people opted to use 1541s with Plus/4s instead of the 1551, in spite of its greater speed. In Europe, the Plus/4 was much more successful, but because tape drives were the most popular storage device in Europe in the 1980s, the 1551 was not very popular in Europe either.
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