SD Card disk drive for C-64?

First off, my bad - I thought the OP was wanting to change the device ID (which is not the drive number, btw**) on a genuine 1541. I'd have no idea how it's done with one of the SD-based drive emulators. "Given the potential flakiness of 1541 drives, why make permanent hardware changes when a basic program allows you to assign the drive to whatever you want for the temporary need of the day?" Though I'm not entirely sure it exists, any "potential flakiness" is probably a very good reason to make the change in hardware. Device IDs assigned via software (with a M-W command to the DOS) don't persist between drive resets and may not persist between serial bus resets either, for that matter. So if the drive does screw up and requires a power cycle, you're back to device 8 again afterwards. This means shutting off one drive, re-assigning the device ID to 9 or whatever, then powering on the second drive. If you're using more than two drives, it really becomes a hassle. In any event, just install a switch (or pair of them..) on each drive and all is well. (** Devices on the CBM serial bus (or IEC bus) have device IDs, with the disk drives usually being 8,9,10 and 11. Each device can actually have two physical drives, 0 and 1. Now in the later era (1540 and beyond) there's only one physical drive per device, which is device 0, the default. But in case you ever wondered why the correct syntax for a DOS command has this "extra" 0:, now you know - as in OPEN 15,8,15,"I0:". It's explicitly specifying drive 0.. as opposed to drive 1.) On Sat, Jan 23, 2016 at 8:00 AM, william degnan <billdegnan at gmail.com> wrote: