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Windows 7: USB External Hard Drive keeps disconnecting.

14 Feb 2010   #1

windows 7
USB External Hard Drive keeps disconnecting.


Windows 7 x86

I've got an USB External Hard Disk Drive (Samsung S2 Portable 500 Gb). In the last 3-4 days it keeps randomly disconnecting when in use... So, Windows starts, it runs fine for an hour or so (in use), then the magic sound strikes. After a couple of seconds it's detected again, and the whole show starts again. Sometimes it reconnects for 3-4 times in a minute. It's driving me crazy!

My USB drivers are up to date, I've unchecked all those Power Management things, I've installed the KB976972 update (tho I'm not quite sure I was suited for it ). I thought it was the cable's fault, so I left it on my brother's Vista PC for about 5 hours playing movies, and it worked...

LE: Now I'm thinking it could be one of the updates 7 made on the 10th of this month...

LE2: It was working fine since Christmas.

My System SpecsSystem Spec

14 Feb 2010   #2

Windows 7 Ultimate 32 bit

is it the only USB device that's giving you issues? is it connected to a USB hub or direct connected to PC also some system specs would be helpfull
My System SpecsSystem Spec
14 Feb 2010   #3

windows 7

It's the only USB that's giving me problems. I've tried switching ports, same thing. Yes, directly connected.

Windows: Microsoft Windows 7 6.1.7600
Internet Explorer: 8.0.7600.16385
Memory (RAM): 3072 MB
CPU Info: Intel(R) Core(TM)2 Duo CPU E4600 @ 2.40GHz
CPU Speed: 2398.1 MHz
Sound card: Speakers (High Definition Audio
Display Adapters: NVIDIA GeForce 8500 GT | NVIDIA GeForce 8500 GT | RDPDD Chained DD | RDP Encoder Mirror Driver | RDP Reflector Display Driver
Monitors: 1
Screen Resolution: 1920 X 1080 - 32 bit
Network: Network Present
Network Adapters: Atheros L2 Fast Ethernet 10/100Base-T Controller
COM Ports: NOT Present
LPT Ports: LPT1
Mouse: 3 Button Wheel Mouse Present
Hard Disks: C: 23.8GB | D: 125.3GB | F: 465.8GB
Hard Disks - Free: C: 8.7GB | D: 18.4GB | F: 62.0GB
USB Controllers: 5 host controllers.
Firewire (1394): Not Detected
PCMCIA (Laptops): Not Installed
Manufacturer: American Megatrends Inc.
Product Make: System Product Name
AC Power Status: OnLine
BIOS Info:
Time Zone: GTB Standard Time
Battery: No Battery
Motherboard: ASUSTeK Computer INC. P5LD2-X/1333
Modem: Not detected
My System SpecsSystem Spec

14 Feb 2010   #4

Windows 7 Ultimate 32 bit

how many USB devices do you have plugged in to this machine?
My System SpecsSystem Spec
14 Feb 2010   #5

windows 7

Keyboard, Mouse and the External HDD.
My System SpecsSystem Spec
14 Feb 2010   #6

Windows 7 Ultimate 32 bit

go back to device manager and look at the USB Root Hub properties look at the total power available per port like mine is 500 mA per port it will also tell you what the devices plugged in require make sure that the external USB drive does not require more that what is available per port like if I plugged in a device that required 750 mA into ports that can only deliver 500 mA you would have to use a seperate Powered USB hub to power such a device
My System SpecsSystem Spec
14 Feb 2010   #7

Windows 7

You might be exceeding the current carrying capability of the USB port. Try hooking a powered USB hub to the port and then plugging the external hard drive to the powered USB hub.
My System SpecsSystem Spec
14 Feb 2010   #8

windows 7

I've got 500 mA available per port. 5 ports.

Keyboard - 100 mA
Mouse - 100 mA
HDD - 2 mA
My System SpecsSystem Spec
14 Feb 2010   #9

Windows 7 Ultimate 32 bit

HDD only 2 mA are you sure about that
My System SpecsSystem Spec
14 Feb 2010   #10

windows 7

Yep! USB Mass Storage Device - 2 mA.
My System SpecsSystem Spec

 USB External Hard Drive keeps disconnecting.

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