When I attach a hard disk drive via the USB port I get error messages like the following every few seconds in the dmesg log:
[ 375.378414] usb 1-1.2: new high speed USB device number 4 using dwc_otg
[ 375.378567] DEBUG:handle_hc_chhltd_intr_dma:: XactErr without NYET/NAK/ACK
This is with Debian and the latest kernel (3.1.9+ #110).
Power is not an issue as the disk is being powered separately from the USB power line.
The disk is attached using a cheap USB/SATA converter (as available on eBay etc.)
I am wondering if this is a pi software problem or an issue with the USB implementation in the USB/SATA adapter.
The USB/SATA adapter works fine when connected to a PC.