On Sun, Nov 27, 2011 at 12:52 PM, Alan McKinnon <alan.mckin...@gmail.com> wrote: > On Sun, 27 Nov 2011 15:08:10 -0500 > sean <tech.j...@myfairpoint.net> wrote: > >> I have two 500GB USB drives that my Gentoo system here will not read. >> Both these drives are fat formatted. >> >> The tail of DMESG, the entries actually go on for a long long time, >> has the following report for either of those two drives, >> [ 6027.085508] ehci_hcd 0000:01:0a.2: detected XactErr len 0/8 retry >> 29 [ 6027.085636] ehci_hcd 0000:01:0a.2: detected XactErr len 0/8 >> retry 30 [ 6027.085760] ehci_hcd 0000:01:0a.2: detected XactErr len >> 0/8 retry 31 [ 6027.085885] ehci_hcd 0000:01:0a.2: devpath 3 ep0in >> 3strikes [ 6027.136031] ehci_hcd 0000:01:0a.2: GetStatus port:3 >> status 001002 0 ACK POWER sig=se0 CSC >> [ 6027.136052] hub 1-0:1.0: unable to enumerate USB device on port 3 >> [ 6027.136062] hub 1-0:1.0: state 7 ports 5 chg 0000 evt 0008 >> >> Both these fat formatted drives are easily read on several other >> systems running Windows or MAC OS X. >> >> The Gentoo system will read small usb memory sticks up to 16 GB fat >> formatted. >> The Gentoo system will also read a 750 GB NTFS drive without problems. >> >> Is anyone able to point me in the direction to figure out why the fat >> usb drives will not be read by the Gentoo system? > > This post > > http://permalink.gmane.org/gmane.linux.usb.general/48758 > > implies possible hardware errors (you seem to have protocol errors on > the USB bus). > > Before proceeding further, I'd try a few more tests to narrow down the > circumstances that produce the errors. > > What results do you get if you plug the drives into different USB > controllers/ports on the gentoo system? > > Can you test if they work with a different kernel version (higher and > lower than the current one in use)? > > What kind of drives are these? Are you plugging USB3 drives into USB2 > ports for example? > > If you are really lucky you might have free space on a drive you can > run mkfs.vfat on and see if that works. > > The results of these simple tests stand a good chance of pointing us in > the right direction for the next step. > -- > Alan McKinnnon > alan.mckin...@gmail.com > >
I have something like 10 USB drives here at home. 9 of those drives works perfectly in 5 machines in the house. 1 drive works when attached to 4 of the machines but produces a similar error when attached to my most expensive i7-980x machine. I've never determined what causes it and have sort of decided it's just some weird incompatibility... - Mark
