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First make sure usb cable connected to harddrive is working fine.
try it in different usb ports.
Press windows key +R key so you can see run then type in run "devmgmt.msc" then press ok so you can see device manager uninstall all usb drivers then it automatic install usb drivers.
Also you need to change registry for that type in run "regedit" then press ok then you can see registry editor then locate below key.
And remove upper filter and lower filter.Then restart computer then check.
Try your harddrive in different computer if it is not recognized on another computer too then your harddrive has internal issue.
Also locate the below key and make sure it's value is 3 not 4.
HKLM\system\currentcontrolset\services\usbstor make sure start value is 3 not 4.
Let me know if you need further assistance.
Thanks for using FixYa
The could be only two reasons for that problem with enclosure or hd. You need first figure out which one is the problem.
Plug the HD directly to the computer and see if computer can recognize it. If computer can recognize HD and you can access it then the problem with enclosure and something got burned when power got back. If you the enclosure still under warranty try to get replacement of if you electronic tinker you might try to fix it. If computer not able to recongnize HD and you can't access it from WIN then HD got fried. I would not recommend to store any important data on HD there is always a chance it will fail at some point.
Ok, you didn't say if the drive had data or not? Anyway, if it is a drive with no data etc, you will first need to Initialize, & Format the drive before use. Is there any way you can connect it up to an "Internal" or "External" SATA port, & "See" if the drive is recognized, then at least you know the drive is OK.. Also try another USB port if available. If you know it is OK, then go to device manager and Uninstall the entire USB layer, reboot, it will re-install the USB again, with default settings, it NOW may be "Seen".
follow these steps: plug in the hard drive go to start-my computer-device manager -usb -action(Scan for hardware changes) if is not recognized this way then go to this site and download the program is free http://www.radarsync.com/.
You may not have installed the HDD correctly in the case... I had the same problem with my Thecus N1050 enclosure, the green power light on the enclosure would come on and the drive would spin up but my PC would not see the HDD!!??... I thought, becuase i could hear the drive spinning that i had it installed correctly but this wasn't the case, when i removed the enclosure again and FIRMLY pushed the HDD into the connector (all the way in) and connected it back up to my PC, it recognised it instantly. Hope this helps!
if as you say its working fine is pc accessing drive via usb and have you set the jumper to master as most external enclosures work on the device being master if you can see the hdd on pc then the laptop needs to have windows re-installed but if the pc is not showing hdd then goto control pannel and Administrative Tools and Computer Management and then Disk Management if showing here then select unallacated drive and properties and set active.
then turn of drive then turn back on and see if comes up in my computer.
only do laptop if pc has hdd viewing in my computer.
hope all goes well