When I try to nibble using ZoomFloppy XUM1541/XU1541 my 1571 drive fails.
C:\Dump>nibread test.nib
nibread - Commodore 1541/1571 disk image nibbler
(C) Peter Rittwage and the rest of the C64 Preservation Project team
http://c64preservation.com
Revision 2014 - Built Apr 18 2017 09:40:05
Drive Version: 73,CBM DOS V3.0 1571,00,00
Drive type: 1571
Bumping...
Initializing
Sending 1571 SRQ support code...
Uploading floppy-side code ($0459 bytes, $300-$759)...done.
Starting custom drive code...USB error in xum1541_wait_status: libusb0-dll:err [_usb_reap_async] reaping request failed, win error: A device attached to the system is not functioning.
USB error in xum1541_ioctl cmd: libusb0-dll:err [_usb_reap_async] reaping request failed, win error: A device attached to the system is not functioning.