I have the same problem as many users. Computer: Acer Aspire 5700 Randomly, my usb 2.0 drive disconnects and gives me a: I have to remount - when I do, it's only at usb 1.1 speed until I restart... a lot of the time, I just have to restart - only to wait one more day for this to happen again. Other interesting notes: All devices connected via USB(I have a hub that has a mouse, keyboard, and cell phone charger attached) do not work after this said event. The harddrive has its own power hookup. However, they do have power as my mouse's laser is on. This JUST started happening when I upgraded to Ubuntu 9.10. van@lywex:~$ uname -a Linux lywex 2.6.31-20-generic #58-Ubuntu SMP Fri Mar 12 05:23:09 UTC 2010 i686 GNU/Linux van@lywex:~$ lsusb Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 006: ID 046d:c016 Logitech, Inc. M-UV69a/HP M-UV96 Optical Wheel Mouse Bus 001 Device 005: ID 046d:c312 Logitech, Inc. DeLuxe 250 Keyboard Bus 001 Device 003: ID 0402:5602 ALi Corp. Video Camera Controller Bus 001 Device 002: ID 050d:0304 Belkin Components Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 002: ID 1058:1100 Western Digital Technologies, Inc. Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub van@lywex:~$ Mar 17 18:57:03 lywex kernel: [77088.124106] usb 1-7: reset high speed USB device using ehci_hcd and address 4 Mar 17 18:57:18 lywex kernel: [77103.299319] usb 1-7: device descriptor read/64, error -110 Mar 17 18:57:34 lywex kernel: [77118.548148] usb 1-7: device descriptor read/64, error -110 Mar 17 18:57:34 lywex kernel: [77118.764072] usb 1-7: reset high speed USB device using ehci_hcd and address 4 Mar 17 18:57:49 lywex kernel: [77133.912079] usb 1-7: device descriptor read/64, error -110 Mar 17 18:58:04 lywex kernel: [77149.164101] usb 1-7: device descriptor read/64, error -110 Mar 17 18:58:04 lywex kernel: [77149.380087] usb 1-7: reset high speed USB device using ehci_hcd and address 4 Mar 17 18:58:15 lywex kernel: [77159.812079] usb 1-7: device not accepting address 4, error -110 Mar 17 18:58:15 lywex kernel: [77159.924129] usb 1-7: reset high speed USB device using ehci_hcd and address 4 Mar 17 18:58:25 lywex kernel: [77170.356082] usb 1-7: device not accepting address 4, error -110 Mar 17 18:58:25 lywex kernel: [77170.356183] usb 1-7: USB disconnect, address 4 Mar 17 18:58:25 lywex kernel: [77170.356194] sd 2:0:0:0: Device offlined - not ready after error recovery Mar 17 18:58:25 lywex kernel: [77170.356222] sd 2:0:0:0: [sdb] Unhandled error code Mar 17 18:58:25 lywex kernel: [77170.356228] sd 2:0:0:0: [sdb] Result: hostbyte=DID_ABORT driverbyte=DRIVER_OK Mar 17 18:58:25 lywex kernel: [77170.356239] end_request: I/O error, dev sdb, sector 837079455 Mar 17 18:58:25 lywex kernel: [77170.356275] sd 2:0:0:0: rejecting I/O to offline device Mar 17 18:58:25 lywex kernel: [77170.356298] sd 2:0:0:0: rejecting I/O to offline device Mar 17 18:58:25 lywex kernel: [77170.356339] sd 2:0:0:0: [sdb] Unhandled error code Mar 17 18:58:25 lywex kernel: [77170.356344] sd 2:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK Mar 17 18:58:25 lywex kernel: [77170.356353] end_request: I/O error, dev sdb, sector 837079487 Mar 17 18:58:25 lywex kernel: [77170.377370] EXT3-fs error (device sdb1): ext3_find_entry: reading directory #8618061 offset 0 Mar 17 18:58:26 lywex kernel: [77170.626026] usb 1-7: new high speed USB device using ehci_hcd and address 7 Mar 17 18:58:31 lywex kernel: [77175.989237] journal_bmap: journal block not found at offset 1642 on sdb1 Mar 17 18:58:31 lywex kernel: [77175.989252] Aborting journal on device sdb1. Mar 17 18:58:41 lywex kernel: [77185.772084] usb 1-7: device descriptor read/64, error -110 Mar 17 18:58:50 lywex kernel: [77195.131637] eth0: link down Mar 17 18:58:56 lywex kernel: [77201.040074] usb 1-7: device descriptor read/64, error -110 Mar 17 18:58:56 lywex kernel: [77201.260077] usb 1-7: new high speed USB device using ehci_hcd and address 8 Mar 17 18:59:06 lywex kernel: [77211.044747] eth0: link up, 100Mbps, full-duplex, lpa 0xC1E1 Mar 17 18:59:11 lywex kernel: [77216.404068] usb 1-7: device descriptor read/64, error -110 Mar 17 18:59:27 lywex kernel: [77231.668107] usb 1-7: device descriptor read/64, error -110 Mar 17 18:59:27 lywex kernel: [77231.884088] usb 1-7: new high speed USB device using ehci_hcd and address 9 Mar 17 18:59:37 lywex kernel: [77242.316089] usb 1-7: device not accepting address 9, error -110 Mar 17 18:59:37 lywex kernel: [77242.428111] usb 1-7: new high speed USB device using ehci_hcd and address 10 Mar 17 18:59:48 lywex kernel: [77252.860101] usb 1-7: device not accepting address 10, error -110 Mar 17 18:59:48 lywex kernel: [77252.860155] hub 1-0:1.0: unable to enumerate USB device on port 7 Mar 17 18:59:48 lywex kernel: [77253.232110] usb 2-4: new full speed USB device using ohci_hcd and address 2 Mar 17 18:59:48 lywex kernel: [77253.431141] usb 2-4: not running at top speed; connect to a high speed hub Mar 17 18:59:48 lywex kernel: [77253.443397] usb 2-4: configuration #1 chosen from 1 choice Mar 17 18:59:48 lywex kernel: [77253.446341] scsi3 : SCSI emulation for USB Mass Storage devices Mar 17 18:59:48 lywex kernel: [77253.446671] usb-storage: device found at 2 Mar 17 18:59:48 lywex kernel: [77253.446681] usb-storage: waiting for device to settle before scanning Mar 17 18:59:53 lywex kernel: [77258.445276] usb-storage: device scan complete Mar 17 18:59:53 lywex kernel: [77258.451389] scsi 3:0:0:0: Direct-Access WD 5000AAV External 1.65 PQ: 0 ANSI: 4 Mar 17 18:59:53 lywex kernel: [77258.452638] sd 3:0:0:0: Attached scsi generic sg2 type 0 Mar 17 18:59:53 lywex kernel: [77258.471221] sd 3:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB) Mar 17 18:59:53 lywex kernel: [77258.481400] sd 3:0:0:0: [sdc] Write Protect is off Mar 17 18:59:53 lywex kernel: [77258.481415] sd 3:0:0:0: [sdc] Mode Sense: 21 00 00 00 Mar 17 18:59:53 lywex kernel: [77258.481424] sd 3:0:0:0: [sdc] Assuming drive cache: write through Mar 17 18:59:54 lywex kernel: [77258.501159] sd 3:0:0:0: [sdc] Assuming drive cache: write through Mar 17 18:59:54 lywex kernel: [77258.501178] sdc: sdc1 Mar 17 18:59:54 lywex kernel: [77258.944291] sd 3:0:0:0: [sdc] Assuming drive cache: write through Mar 17 18:59:54 lywex kernel: [77258.944323] sd 3:0:0:0: [sdc] Attached SCSI disk Mar 17 19:01:39 lywex kernel: [77364.003817] kjournald starting. Commit interval 5 seconds Mar 17 19:01:39 lywex kernel: [77364.014247] EXT3 FS on sdc1, internal journal Mar 17 19:01:39 lywex kernel: [77364.014262] EXT3-fs: recovery complete. Mar 17 19:01:39 lywex kernel: [77364.045236] EXT3-fs: mounted filesystem with writeback data mode. van@lywex:~/library$ Let me know if you need additional information.