<storage> Commodore Business Machines
's "advanced" disk drive
for the C128.
It was the double-sided version of the Commodore 1570
disk drive but, unlike the 1570, worked quite well.
The 1571 supported "burst mode" loading when used on a C128 in native mode, which increased the transfer speed from 1541 speed to about three kilobytes per second (about a 10-fold increase).
The 1571 could be told to emulate a 1541
for use with a C64
or 1541 disks.
Bugs in early releases of the 1571 ROM
affected access to the second side of the disk.