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Sue TaylorFlag for United States of America

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URGENT - 900GB Hyper V disk failing when migrating to new disk.

Hi everyone,
I have a new client that the old IT guys decided it would be a great idea to run the VM on a USB hard drive for the last couple of years. This seems logical--especially for the all-inclusive server. You know the type. File server, print server, database server, LOB application server, email server, etc...
The client just spent some money on new hardware, however I couldn't get them to split up the roles of the server. It sounds like it's being overworked, but in all honesty it's a 15-user service provider running very low consumption tasks.
The VM (Server 2012 - the reason they don't want to spend extra money on licensing since they already did) is running on an external USB drive. I've got the drive plugged into the server via USB and I have a 1.8TB RAID-5 array ready to store the server, but every time I try to transfer the 900GB VM file it fails.
I guess what this boils down to, is how would you recommend I handle migrating this very large, single 900GB file from one drive to another when it keeps failing?
The move says 8-10 hours when I try it and each time it gets around 50% and then fails. I suspect we may have some failing sectors on the drive--another reason to move this data ASAP.
Thanks in advance for your suggestions everyone!
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Philip Elder
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I've attempted to backup and restore to a new VHDX file and that also failed. I've attempted to do a P->V and that failed. I believe I have a bad sector/block on the hard drive. I didn't get any error codes. I think I'm going to do this the "hard" way. I need to build a new VM server and migrate everything over. Thanks for trying, guys.
I had to bail on this. It's not the fault of anybody here, it's my own doing. Thanks for trying everybody.