I was trying to add one partition on a single 2T disk, I was using easeus Partition Master, I went with the Add partition -> specify partition size -> apply changes routine. And Partition master gave me a successful notice, so I hibernated my win7 comp (should've restarted instead I guess) pull out the drive, and forgot all about it.

Now I found that my drive is inaccessible, and when I plug it in using sata connection, the whole drive shows up in partition master as one huge 1.8T unallocated space.

Is there a way to reverse/repair it? I have almost 500G data on it, I don't want to lose them.

The drive is a brand new one and I can assure that it has no hardware problem(s).

P.S. I think there should be a way to repair it, a way to let me somehow reverse the file table or partition table or tings like that to previous states, before I tried to resize it that is.

Edit: Shortly after I hit "apply" button, there is a "updating system information" dialog box, which is quite normal during the end of a partioning operation. And after that, I can see 2 partition been done well as planned. I thought everything was AOK. How it went wrong was completely beyond me, except that I think I should've restarted instead of hibernated my win7 and pull the drive off the SATA cable.

Have you tried reconnecting the drive and restarting? It's possible the the drive is just taken offline and pending re-partitioning when you reboot.

If that doesn't work, try testdisk to analyze and rewrite the partition tables. It's a command prompt program that's very good at analyzing and fixing these types of issues. You can get it here: http://www.cgsecurity.org/wiki/TestDisk_Download

If you need help using the app let me know. I'll be in the office from 9-5 Eastern time tomorrow. I could probably walk you through it, or remote in if needed.

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Data Medics - Hard Drive, SSD, and RAID Data Recovery Service Company

Hey thanks for your help man, I haven't tried that yet, but I'll do it ASAP and give you an update later. Also, I'm guessing I have to use that program anyway, so I'm gonna download it first.

Me again, that was a real life-saver back there. I can't begin to thank you enough. All things are fixed now.

Thanks man! The tool you recommended was really handy!