Windows 10: HDD Partition becomes unallocated after Windows 10 installation.

I have a SSD where my operating system is installed.

I also have a 3 3TB drives.

A 746.52 partition on one of the drives became unallocated after installation of windows 10.

I've managed to recover all the data from the unallocated partition. Would now like to fix the partition.

I think it may be something to do with MBR/GPT?

Here's a screen print from disk management.





Any help appreciated.

:)

 

Unallocated HDD partition has become invisible

Thanks for pointing me in the right direction. I'll put up my question there

 

Unallocated HDD partition has become invisible

Guys I used easeUS data recovery software to recover deleted data and upto 500 MB I recovered but since it was a freeware so that's all I could get. Then I found another freeware onwhich there was no such restriction mentioned so I thought let's give it
a shot. Problem I am facing now is I can't see that unapportioned HDD which is almost 800 gb .. If I use disk management took then I can see that unallocated portion but not in windows explorer, because of which I can't select in the downloaded recovery tool
and recover remaining data.

can someone pls guide me how to make it visible again - the allocated part of HDD... I haven't made partitions other than c drive because I read once I made partitions I will lose data permanently..

Any help in this regard will be appreciated.

Thanks

 

Can you boot with Disc 0 completely disconnected?

I'd guess you can. If so, I don't think you need partition I on disc 0.

You should be able to make disc 0 to behave like disc 2, which is also a 3 TB drive. Disc 0 appears to be initialized as MBR. If you want it do be like disc 2 with a single partition covering the entire 3 TB, you'd need to re-initialize it as GPT, just like disc 2. You'd have to move that data off of the J partition and then delete the J partition to do that. I think there are applications that say they can convert from MBR to GPT without losing data, but I wouldn't trust that. I'd plan to wipe that drive and start over--but you first need to confirm you can boot with disc 0 disconnected.

Was that drive 0 connected when you installed to the SSD? If so, usually a bad idea to have more than 1 drive connected.

 

The fatal error was not disconnecting the other HDD, which I usually do. Just got sloppy!

Thanks for the reply.

I was hoping to find a way to get the unallocated partition working, bought a new 3tb drive today to clear J and start from scratch in case this was a non starter.

Anyone have an idea what caused the problem?

 

You can't "get it working" as is. It's not a partition. It's unallocated space. MBR discs aren't going to recognize 3 TB on a disc--only a little over 2 TB.

You can start over with that disc, initializing it as GPT. As I mentioned in my first post.

 

Were you able to fix it, and how did you recover the data? I am having the same issue and was not sure what to do. I would have sent you a PM but I have less than 5 posts.

 

All,

I just registered here to share this thread:

http://answers.microsoft.com/en-us/w...c-cc3c510d5f26

MS hasn't been very helpful, but there is some advice there which may be of use in recovering your data.

 

I had the exact same problem. running a Seagate HDD with 6TB, 2TB C:/ and 4TB for storage

I spent 2 weeks trying out various recovery programs, popping it into a toaster and seeing if I could pull the data off the unallocated storage onto an external, and even booting into a live USB of Lubuntu but nothing was working.

Then I tried running the seagate tool that came with it and it gave me a flag saying that it needed the Virutal Disk Driver to be installed

I installed the driver, gave the partition a letter and presto, all files and the partition were back good as new!

yup, all that effort for 2 weeks when all that happened was that the upgrade from 7 to 10 deleted a driver.


Here's to hoping my experience will help others especially since this board was a top result when search for answers!

 

My machine boots to Windows 10 insiders preview, or Windows 8.1. Windows installations are on separate hard drives. Upon the previous major update to build Windows 10 insiders preview, build 14257, my secondary hard drive popped up as unallocated in Windows 10. Not only that, it couldn't be accessed by diskpart, or other various and sundry partition software out there. It's a 1 TB WD Black hard drive. It was working fine in Windows 10, before the update. In fact when I boot to Windows 8.1 it still works fine and all my data is intact. So. Check your drivers, before you go purchasing new hardware or losing critical data. In my case it was the sata driver for my asus motherboard. Once I installed that. The drive popped back into drive manager as active and healthy. I just had to give it a drive letter, and it was back to normal in Windows 10.

 

For me it was because the "virtual driver" for seagate was erased by the upgrade from win7 to win10. Because of that same issue it prevented me from recovering the files even through mini tool recovery and various other programs (even dual booting into linux did nothing). Yes I could see the files in the recovery tools but I couldn't extract them. Of course after I figured out what was going on I simply re-installed the virtual driver which recognized the 3TB partition and then I gave it a drive letter and everything was there, none the worse for wear.


I won't deny, I was one step away from just reformatting it but luckily I didn't because I would've kissed a TB or so of files goodbye, plus knowing what I know now, it wouldn't have resolved the issue.

 

I scanned my hard drive for 24 hrs with mini-tool! *cry.. before I realized that I only needed to uninstall hard drive driver to let it re-install!! Uggggg!! *Mad All working well now *Smile. (Almost reformatted also *Confused... so. glad. I . didn't .) Thanks!!

 

I just got my hands onto a new samsung 500gb ssd 850 evo.
Thought I would do the smart route this time, and partition the drive... 100gb for windows (when created, it also created a recovery and a MSR (from memory LOL) no clue why.)
Anyways, no dramas there. installed windows 10 (first time, im used to 7 heaven LOL... not liking 10 all that much yet- I not got touch screen LOL)... I had a look at my drives and the left over was not there... pressed windows button+x and clicked on drive management, and yeah, was there, just black and unallocated space... well I just right clicked and then clicked "new simple volume" and then gave it a drive letter... and bobs your uncle... all good *Smile

Though, like ignatzatsonic said, MBR don't recognize over 2tb or something.