Hi as I connect photon+ modem through usb it shows an disconnected or unavailable device .But same I connect to other system it connects

I reinstalled my OS and now my computer won't detect, nor let me access my Samsung SV8004H USB Mass Storage Debice. Any suggestions? Advice? Thank You,.

Sometimes when I try to disconnect my external USB hard drive, I get a message saying that it can't be removed at this time because it is being used by some other program. Try again later. Actually, I have closed all windows and programs I know about, so something else is locking the hard drive...

After connecting my external hard drive to a usb port. Assigns to a used drive F. to get to the ext hd I have to disconnect F then I'm able to open the ext hd. How can I get the ext. hd to go to the next available drive letter or can I assign one?

How can I install it in XP Professional? When the USB is connected and the power is on the computer automatically install the drivers and releases "new hardware ready to use" but the device is not shown anywere as an "external drive" or so.