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I have a USB HD connected using SATA to USB connection to the a PC with XP, before it used to be recognised fine and assigned a drive letter but since some malware issues with my PC, I had to repair the XP installation, the hard drive is not being assigned a drive letter so I can't access it. It is detected as USB mass storage however and I have looked in Hard drives in computer managment too. I have also connected the hard drive to another PC and it is accessible.
1Could be a power issue, it gets enough power to be detected but not enough to power the hdd. – Nifle – 2011-08-31T13:21:51.317
Ok, currently I have SATA to usb adapter which uses mains power and since it works on the laptop, I assume there is enough power? – Rubans – 2011-08-31T14:45:07.243
If it has an external power source my suggestion is not likely to be correct. – Nifle – 2011-08-31T20:52:53.907