external hd asking to be formatted

  conrail 15:00 25 Nov 2011

using windows 7 64 bit sp1, using old hd from last pc as external drive, using it for backup, today when I switched it on I get a message telling me it needs to be formatted, can anybody explain please on why this has suddenly happened, formatting no problem as I still have files on pc, just like to know why this message has suddenly popped up, drive is SATA if it helps,

  difarn 18:55 25 Nov 2011


Have you given this drive a dedicated drive letter?

Open RUN, type in "diskmgmt.msc'. When it opens, find the drive and give it a dedicated drive letter.

It may be that the drive has become corrupted - type in chkdsk in the search field under all programmes (click on the start button first).

You should able to find out what it says about the drive. There may be some advice to follow. Does it say that the file system is RAW? If so then for some reason it has been corrupted - could it have been disconnected from pc without using the remove safely hardware facility for example? In some instances Windows 7 doesn't like external hard drives being left plugged in while you are shutting down or logging on.

Have you tried this with another pc?

  conrail 20:08 25 Nov 2011

thanks difarn, appreciate your help, disk management shows drive K, 465.76Gb RAW, it is always plugged in but I use the on/off switch on the unit to switch it on/off, not tried on another pc, will try on wifes laptop when I get the chance, will let you know outcome, again many thanks for your advice.

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