First of all I would like to inform you that I saw a question similar to mine but the error was different, so here's my problem...

I have an external HD samsung s2 model of 500GB and a day to day just stopped working, tried in other systems (windows and mac) however are not recognized. In the windows device manager when I insert the usb it states that the device in question are not working properly.

Well, in the logs of my ubuntu 4.12 I see the following message when I insert my usb device in:

[ 2967.560216] usb 7-2: new full-speed USB device number 2 using uhci_hcd
[ 2967.680182] usb 7-2: device descriptor read/64, error -71
[ 2967.904176] usb 7-2: device descriptor read/64, error -71
[ 2968.120227] usb 7-2: new full-speed USB device number 3 using uhci_hcd
[ 2968.240207] usb 7-2: device descriptor read/64, error -71
[ 2968.464063] usb 7-2: device descriptor read/64, error -71
[ 2968.680087] usb 7-2: new full-speed USB device number 4 using uhci_hcd
[ 2969.092085] usb 7-2: device not accepting address 4, error -71
[ 2969.208155] usb 7-2: new full-speed USB device number 5 using uhci_hcd
[ 2969.624076] usb 7-2: device not accepting address 5, error -71
[ 2969.624118] hub 7-0:1.0: unable to enumerate USB device on port 2
[ 4520.240340] usb 7-1: new full-speed USB device number 6 using uhci_hcd
[ 4520.364079] usb 7-1: device descriptor read/64, error -71
[ 4520.588109] usb 7-1: device descriptor read/64, error -71
[ 4520.804140] usb 7-1: new full-speed USB device number 7 using uhci_hcd
[ 4520.924136] usb 7-1: device descriptor read/64, error -71
[ 4521.148083] usb 7-1: device descriptor read/64, error -71
[ 4521.364105] usb 7-1: new full-speed USB device number 8 using uhci_hcd
[ 4521.776237] usb 7-1: device not accepting address 8, error -71
[ 4521.888206] usb 7-1: new full-speed USB device number 9 using uhci_hcd
[ 4522.296102] usb 7-1: device not accepting address 9, error -71
[ 4522.296150] hub 7-0:1.0: unable to enumerate USB device on port 1
[ 4749.036104] usb 7-2: new full-speed USB device number 10 using uhci_hcd
[ 4749.156209] usb 7-2: device descriptor read/64, error -71
[ 4749.380215] usb 7-2: device descriptor read/64, error -71
[ 4749.596206] usb 7-2: new full-speed USB device number 11 using uhci_hcd
[ 4749.716409] usb 7-2: device descriptor read/64, error -71
[ 4749.940110] usb 7-2: device descriptor read/64, error -71
[ 4750.156257] usb 7-2: new full-speed USB device number 12 using uhci_hcd
[ 4750.572150] usb 7-2: device not accepting address 12, error -71
[ 4750.684215] usb 7-2: new full-speed USB device number 13 using uhci_hcd
[ 4751.100182] usb 7-2: device not accepting address 13, error -71
[ 4751.100224] hub 7-0:1.0: unable to enumerate USB device on port 2

Here is my system:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810

00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 02)
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 2 port SATA Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
00:1f.5 IDE interface: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E) 2 port SATA Controller [IDE mode] (rev 02)
02:01.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
02:01.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 04)
02:01.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 21)
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5756ME Gigabit Ethernet PCI Express
0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

Does anyone have any clue what would be the problem?