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* the USB-to-disk-drive adapter inside the enclosure.
One of these components has failed.
Try a different USB cable.
Try connecting to a different USB port on your computer.
Try connecting to a USB port on a different computer.
Take a "multi-meter" and measure both the voltage and amperage output from the AC adapter, and compare with the specifications on the label on the adapter.
Open the enclosure, and remove the disk-drive, and then connect it as a "slave" disk-drive in a desktop computer, to see if it works at all.
Purchase a new, compatible, disk-drive, and install it in the enclosure, to "revive" your external storage device.
Get the part-number and serial-number from the label on your disk-drive, and access the manufacturer's web-site, and use "check warranty status", to see if they will replace the device, at minimal cost to you.
1. the usb connector in the PC may have a broken board contact needs soldering or replacement. 2. there may be a broken USB cord to the external usb drive 3. the electronic controller in the USB case may not be working. 4. A new case may be needed with a new controller.
You need the power from the 2 USB ports in order for the Drive to have enough Power.
Try moving the USB Ports to another Port or Flip Flop the 2 USB Cables.
Another option is to uninstall the unknown device. Remove the USB Cables, Uninstall Shut Down, Re-Start.
NOTE: Certain Ports on your System are USB 2.0 and some are not. Try to use the 2.0 port listed in the Manual... it will be faster and may carry the Power.
I have the same issue. I have 4 Simpletech Signature 250GB drives. They all worked fine at first. After about six months two of them started connecting at USB 1 speeds. It occurs on 4 different computers!!! The post about it being the computer assumes is wrong. How can it work fine for six months and then suddenly change. Also it occurs on different computers. I have submitted a tech support request with simpletech and will post the results.
What system is the laptop?
File differences is the ext-hard drive FAT32 or DOS? Therefore XP [NTFS] is not 'seeing' its content.
On the XP machine
go to start/Control Panel/Admin tools/computer management/storage/removable storage/and check the file type
Open Administrative tools, Computer management applet; under storage, disk management.
You will probably need to partition and reformat. If this drive is used only on XP machines, then format NTFS, otherwise FAT32.