My 250 GB SATA Seagate HDD is failing it seems Third replacement in Two years . However unlike the previous two failures ,this time SMART,Short and Long DST (Seatools bootable CD) didn't detect any fault . The problem I face is ,HDD gets uninstalled and reinstalled randomly . Today the drive has become inaccessible . Ironically I planned my Backup only Today . I have strong suspicions ,this is a driver issue . Any Ideas or suggestions will be helpful .