I've used this hard drive everyday and stored my files there. Unfortunately, it's not appearing in my computer but the blue LED lights up and I can hear typical sounds when you start up a hard drive. I just opened it last night but now it's not appearing. I tried on different laptops PC and mac but there's nothing. It's the first time that happened. I don't have any back up for the files and those are really important.
samsung G2 portable hard drive
model number: HX-MU050DC
After plugging in the device, go to device manager (In run type "devmgmt.msc") In Device manager go to "Universal serial bus controllers" It should list the storage devices that you have connected to your PC. Right click and then click "Uninstall. Remove the USB drive and restart your system.
Try connecting the device again
Whether it recognized in BIOS?
For accessing BIOS press Del, F2 or F12 according to the manufacturer.
see whether the hard disk(which you say not recognized in my computer) is presented in the list of booting device.
Also check it in Disk management.
For accessing disk management,
Right click on My computer-->manage-->disk management.