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External HDD, Data Error (Cyclic Redundancy Check).

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I have a SAMSUNG-HM400LI 400GB portable hard drive. Unfortunately i was transfering a large portion of data of data from it to another portable hard drive i have it froze, so i unplugged it, silly i no. Now when ever i plug it in it tells me "Disk must be formatted before being used", i have 400gb of valuable data i need from this drive. Ive tried different ways of getting into it through CMD, it wont even allow me to CHKDSK, replies with "Data Error (Cyclic Redundancy Error)". Ive tried using EASEUS Partition Recovery and still not luck, it tells me it fails to find the lost or corrupted partitions.

Can anyone help?
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You can try the program TestDiskto recover your data, it is free program that does not need to be install to run and it as help me before to recover data from hard drives that are in need of re-formating before been able to be used again.

You can download it here
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