I "turn on USB storage", and I correctly see the sd card unit on my computer. I can browse the directories, but as soon as I try to copy a file out, after 8MB it crashes:
- on the android device it counts as no longer turned on
- on the computer it complains "device or resource busy" (of course, since it's not on anymore)
I have tried copying a file smaller than 8MB and it worked fine.
Phone is a Nexus One with stock android 2.3.6, computer is OSX 10.6 but I also tried on a windows machine and the result was the same, so I'd safely say it's phone's fault.
Disabling debugging mode, as suggested by this question, and then rebooting (just to be safe) didn't help.