I forgot the unlock password for hdd what can I do? emachine d620 notebook

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Either format the drive or replace it.
I would format it as there is probably nothing wrong with it.
Place your system disc in the DVD drive and let it get on with it.

I think there is a new feature on later notebooks, called "drive-lock".
It uses a password to lock the hdd, even if the hdd is swapped to another PC.

You might be able to get round it, if you connect it to an old Laptop or Desktop, where the bios doesn't support "drive-lock".

Or you could try "Ultimate Boot CD" from http://www.ultimatebootcd.com/
This will allow you to make a boot CD.
You could then try the program called "ATA Password Tool 1.1", which is supposed to unlock any locked hdd.

And if that doesn't work you'll need to call up dell.

Remove cmos battery, clear cmos with jumper (Be aware to ensure no power cables plugged in to PC or it will damage mobo), re-insert and it will reboot.

install fresh copy of xp on different location of pc and extract files from ealier installed xp

Link to your users guide:
http://support.gateway.com/emachines/Mobile/2008/eMachines/eMD620/emd620ul.shtml

how can i unlocked my laptop latitude D620 i forgot my password. now i cant get in it

I got my Dell Master Password from http://www.bios-password.kickme.to/
This seems the best price in the net