The VIC-1571 or Commodore 1571 (in Germany VC-1571) was a diskdrive made by Commodore as a companion for the C128 in 1985. It is superior to the VIC-1541 in that it can use both sides of the disk, and it has a high speed mode only available on the 128. The 1571 is completely backwards compatible with the C64. When attached to a 64, or a 128 in C64 mode, it will boot into 1541 emulation mode. This emulation is nearly perfect. It is also possible to use the 1571 to read and write disks that have been written on both sides. The 1571 also has a controller that is capable of reading MFM (PC) formatted disks, which makes transferring disks images easier (with the right software, of course).
This drive was built as a replacement to the 1541 series and when coupled with the Commodore 128, has enhancements for greater speed, capacity, etc.
The following is a rundown of features:
GCR format Single sided double sided Total unformatted capacity 252019 bytes 252019*2 bytes Total formatted capacity 174848 bytes 349696 bytes Maximum Sequential file size 168656 bytes 337312 bytes Maximum Relative file size 167132 bytes 167132 bytes Record per file 65535 65535 Files per diskette 144 144 Tracks per diskette 35 70 Sectors per track 17-21 17-21 Sectors per diskette 683 total 1366 total Blocks available 664 free 1328 free Bytes per sector 256 256 MFM format Total unformatted capacity 500000 bytes per side Total formatted capacity Sector Size 128 133120 bytes per side Sector Size 256 163840 bytes per side Sector Size 512 184320 bytes per side Sector Size 1024 207800 bytes per side Maximum tracks per disk 40x2 sides Sectors per track Sector Size 128 26 Sector Size 256 16 Sector Size 512 9 Sector Size 1024 5
 Disk Image Format
Disks for the 1571 disk drive are represented by the D71 disk image format. These disk images are used to transmit entire disks for use with emulators and mass storage devices.
 Setting the Device number
The 1571 has two switches on the back that allow to set the device number:
|Device||Left Switch||Right Switch|