Computer can't see external hard drive

[Guest]

Hello,
what should i do, my computer can't read my hard drive-external, i have a lot of file to recover, please help.

 

[gtvr]

Start by posting information - what connection type, what type of HD, what OS. Did something change suddenly? Does it have any status lights?

 

[agyiri_joe]

Start by posting information - what connection type, what type of HD, what OS. Did something change suddenly? Does it have any status lights?

usb samsung and boyh XP and windows 7