Booted into Jaunty desktop Live CD worked fine, kernel 2.6.28-11 It seems between mainline and the ubuntu kernel there is no change: Trying Mainline kernel: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.30/ linux-image-2.6.30-020630-generic_2.6.30-020630_i386 161.572012] usb 1-8: new high speed USB device using ehci_hcd and address 8 [ 161.713059] usb 1-8: configuration #1 chosen from 1 choice [ 161.713759] scsi9 : SCSI emulation for USB Mass Storage devices [ 161.714247] usb-storage: device found at 8 [ 161.714250] usb-storage: waiting for device to settle before scanning [ 166.712138] usb-storage: device scan complete [ 166.712623] scsi 9:0:0:0: Direct-Access ST375064 0NS PQ: 0 ANSI: 2 CCS [ 166.713670] sd 9:0:0:0: Attached scsi generic sg6 type 0 [ 166.714603] sd 9:0:0:0: [sdf] 1465149168 512-byte hardware sectors: (750 GB/698 GiB) [ 166.715348] sd 9:0:0:0: [sdf] Write Protect is off [ 166.715353] sd 9:0:0:0: [sdf] Mode Sense: 34 00 00 00 [ 166.715356] sd 9:0:0:0: [sdf] Assuming drive cache: write through [ 166.720468] sd 9:0:0:0: [sdf] Assuming drive cache: write through [ 166.720474] sdf: sdf1 [ 166.740143] sd 9:0:0:0: [sdf] Attached SCSI disk [ 166.988020] usb 1-8: reset high speed USB device using ehci_hcd and address 8 [ 167.112015] usb 1-8: device descriptor read/64, error -71 [ 167.340017] usb 1-8: device descriptor read/64, error -71 [ 167.556014] usb 1-8: reset high speed USB device using ehci_hcd and address 8 [ 167.680013] usb 1-8: device descriptor read/64, error -71 [ 167.908018] usb 1-8: device descriptor read/64, error -71 [ 168.124016] usb 1-8: reset high speed USB device using ehci_hcd and address 8 [ 168.532014] usb 1-8: device not accepting address 8, error -71 [ 168.644012] usb 1-8: reset high speed USB device using ehci_hcd and address 8 [ 169.056012] usb 1-8: device not accepting address 8, error -71 [ 169.056062] usb 1-8: USB disconnect, address 8 [ 169.168023] usb 1-8: new high speed USB device using ehci_hcd and address 9 [ 169.292012] usb 1-8: device descriptor read/64, error -71 [ 169.520013] usb 1-8: device descriptor read/64, error -71 [ 169.736017] usb 1-8: new high speed USB device using ehci_hcd and address 10 [ 169.860021] usb 1-8: device descriptor read/64, error -71 [ 170.088016] usb 1-8: device descriptor read/64, error -71 [ 170.304019] usb 1-8: new high speed USB device using ehci_hcd and address 11 [ 170.712010] usb 1-8: device not accepting address 11, error -71 [ 170.824014] usb 1-8: new high speed USB device using ehci_hcd and address 12 [ 171.240012] usb 1-8: device not accepting address 12, error -71 [ 171.240029] hub 1-0:1.0: unable to enumerate USB device on port 8 [ 171.508012] usb 5-2: new full speed USB device using uhci_hcd and address 2 [ 171.628016] usb 5-2: device descriptor read/64, error -71 [ 171.852011] usb 5-2: device descriptor read/64, error -71 [ 172.068015] usb 5-2: new full speed USB device using uhci_hcd and address 3 [ 172.188019] usb 5-2: device descriptor read/64, error -71 [ 172.412013] usb 5-2: device descriptor read/64, error -71 [ 172.628011] usb 5-2: new full speed USB device using uhci_hcd and address 4 [ 173.036010] usb 5-2: device not accepting address 4, error -71 [ 173.148020] usb 5-2: new full speed USB device using uhci_hcd and address 5 [ 173.556018] usb 5-2: device not accepting address 5, error -71 [ 173.556032] hub 5-0:1.0: unable to enumerate USB device on port 2 Updated today and rebooted: Linux udc 2.6.30-9-generic #10-Ubuntu SMP Fri Jun 12 13:05:04 UTC 2009 i686 GNU/Linux Get the following: [ 1558.793401] sd 10:0:0:0: Attached scsi generic sg5 type 0 [ 1558.795349] sd 10:0:0:0: [sde] 1465149168 512-byte hardware sectors: (750 GB/698 GiB) [ 1558.798439] sd 10:0:0:0: [sde] Write Protect is off [ 1558.798443] sd 10:0:0:0: [sde] Mode Sense: 34 00 00 00 [ 1558.798445] sd 10:0:0:0: [sde] Assuming drive cache: write through [ 1558.800553] sd 10:0:0:0: [sde] Assuming drive cache: write through [ 1558.800556] sde: sde1 [ 1558.812472] sd 10:0:0:0: [sde] Attached SCSI disk [ 1559.004105] usb 1-8: reset high speed USB device using ehci_hcd and address 17 [ 1559.128015] usb 1-8: device descriptor read/64, error -71 [ 1559.352034] usb 1-8: device descriptor read/64, error -71 [ 1559.568027] usb 1-8: reset high speed USB device using ehci_hcd and address 17 [ 1559.692021] usb 1-8: device descriptor read/64, error -71 [ 1559.920048] usb 1-8: device descriptor read/64, error -71 [ 1560.136040] usb 1-8: reset high speed USB device using ehci_hcd and address 17 [ 1560.548011] usb 1-8: device not accepting address 17, error -71 [ 1560.660025] usb 1-8: reset high speed USB device using ehci_hcd and address 17 [ 1561.076016] usb 1-8: device not accepting address 17, error -71 [ 1561.076842] usb 1-8: USB disconnect, address 17 [ 1561.188088] usb 1-8: new high speed USB device using ehci_hcd and address 18 [ 1561.312015] usb 1-8: device descriptor read/64, error -71 [ 1561.540022] usb 1-8: device descriptor read/64, error -71 [ 1561.756039] usb 1-8: new high speed USB device using ehci_hcd and address 19 [ 1561.880024] usb 1-8: device descriptor read/64, error -71 [ 1562.108024] usb 1-8: device descriptor read/64, error -71 [ 1562.324047] usb 1-8: new high speed USB device using ehci_hcd and address 20 [ 1562.736022] usb 1-8: device not accepting address 20, error -71 [ 1562.848026] usb 1-8: new high speed USB device using ehci_hcd and address 21 [ 1563.256009] usb 1-8: device not accepting address 21, error -71 [ 1563.256024] hub 1-0:1.0: unable to enumerate USB device on port 8 [ 1563.524021] usb 5-2: new full speed USB device using uhci_hcd and address 14 [ 1563.704016] usb 5-2: device descriptor read/64, error -71 [ 1563.928018] usb 5-2: device descriptor read/64, error -71 [ 1564.144012] usb 5-2: new full speed USB device using uhci_hcd and address 15 [ 1564.264013] usb 5-2: device descriptor read/64, error -71 [ 1564.488022] usb 5-2: device descriptor read/64, error -71 [ 1564.704016] usb 5-2: new full speed USB device using uhci_hcd and address 16 [ 1565.112014] usb 5-2: device not accepting address 16, error -71 [ 1565.224012] usb 5-2: new full speed USB device using uhci_hcd and address 17 [ 1565.632013] usb 5-2: device not accepting address 17, error -71 [ 1565.632027] hub 5-0:1.0: unable to enumerate USB device on port 2