Page "Commodore 1570" Paragraph 3

Although the 1570 was compatible with the Commodore 64, the C64 wasn't capable of taking advantage of the drive's higher-speed operation, and when used with the C64 it was little more than a pricier 1541.

Also, many early buyers of the C128 chose to temporarily make do with a 1541 drive, perhaps owned as part of a previous C64 setup, until the 1571 became more widely available.