Commodore Business Machines's 3.5 inch
disk drive for the
Commodore 64 and
Commodore 128. The drive
stores 800 kilobytes using an
MFM format which is
different from both messy-dos 720 kb, and the
Amiga 880 kb
formats.
The 1581 supports a poor imitation of
directories which are
really just partitions and largely unused. It also supports
burst loading like the
Commodore 1571, but is actually
faster as it is better designed. It has 3160 blocks free
when formatted.
The 1581 is the highest density C64 serial bus drive made by
Commodore. However Creative Micro Designs (CMD) make the
FD2000 (1.6MB) and (until recently) the FD4000 (3.2MB)
3.5" disk drives.
GEOS users like 1581s as they are very
fast when used with GEOS.
See also
Commodore 1541,
Commodore 1571.