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An USB flash drive is made out of a memory and extremely simple controller chip installed on a tiny board with a connector.
If the drive is completely unresponsive then the chip died. This is terminal, nothing can be done to save it or to recover what was in it.
Make sure it is inserted all the way into the usb port. If nothing comes up, this doesn't mean it isn't connected, it just means autoplay isn't on. Once it is plugged in, go to the start menu > computer. This will open a folder with all your drives, both internal and external. Double click on your flash drive's icon to open it.
Try unplugging the power cord from the hard drive and leave it it off for about a minute. Then plug the power back in. If it still doesn't show up, restart the computer. You can also plug the hard drive into a different USB port. Hope this helps.
It's definitely not Win7. The Operating system has nothing to do with it. You'd need to isolate the issue first. It should be just a plug and play device like a usb flash drive.
Try plugging the HDD to another computer. If it works, then it's a problem with the computer. If it doesn't, then you can focus on the HDD itself.
You can also try the following steps: - Try turning the computer on while the USB HDD is plugged to see if it's going to be detected. Plug it directly to the usb port and not thru a hub or extended usb cord. - Go to the device manager and remove all of the USB host controller under USB controller, which is usually the last controllers located below. Then follow the step above.
There are other things that you can do to check it but try the steps above first and let me know what happens before we go further.
Many times this is due to the drive letter the flash drive wants to use is already taken.. Right click on my computer, click manage and go to disk management to see what drive letters are taken. try plugging into a different pc to see which letter it comes up so you can compare to what is being used on your PC.
Go to "Control Panel>>>System>>>Device Manager.Once in Device Manager,then click on "Disk Drives" (Make sure your flash drive is plugged in before you do this).You should see your flash drive listed by it's name (SanDisk Cruzer...). If you don't see your flash drive listed, the computer is not recognizing it and your drive may have been damaged by static electricity. If your flash drive is listed, then it's a more complicated troubleshooting procedeure than I can Walk you through in one posting. So try looking in "Device Manager" and then let me know what happened.
"limitation is that flash memory has a finite number of erase-write
cycles. Most commercially available flash products are guaranteed to
withstand around 100,000 write-erase-cycles, before the wear begins to
deteriorate the integrity of the storage"
This means that your flash card may have been damaged by not removing
correctly Flash card are not that reliable AS previous pen drives just a sugestion
The USB Isn,t supplying/providing enough Power to the device.
Search e-bay or similar for a 2 into 1 USB Cable.
Then power the unit with 2 USB Ports on the Computer.
2 x USB Into 2 x Sockets On P.C. 1 x Into Device Drive.
This will be enough power to operate the Device Correctly.
I,ve done this on several external Drives, never failed for Me.