Hard drive

when i listened t my mp3 player for a long time i then found that after it had caused an error and it said that i could format the hard drive on the device or use the coputer instead. I formatted the hard drive on the device and it then told me that i had to rip the hard drive which would lose all the files that was stored on the device. It then came up with a message that said that it couldnt access the error and couldnt read the hard drive. I then tried to sort the problem out by using the computer and it wouldnt recognise the usb cable at first, then when it did all it told me was that the new device has an error on it and may not work and now i cannot access any of my music files.