Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: 3TB external suddenly becomes 746GB unallocated

24 Jun 2014   #41
WhyAlwaysM3

Win 7 x64 and Vista x64
 
 

Quick scan result
3TB external suddenly becomes 746GB unallocated-activepartitioncapt1.jpg

'New Volume' show data, but 'New 3' shows this
3TB external suddenly becomes 746GB unallocated-activepartitioncapt3.jpg

'New 4'
3TB external suddenly becomes 746GB unallocated-activepartitioncapt4.jpg

'New 5'
3TB external suddenly becomes 746GB unallocated-activepartitioncapt7.jpg




My System SpecsSystem Spec
.
24 Jun 2014   #42
Anshad Edavana

Windows 7 Ultimate x64
 
 

Yes, only "New Volume" seems to be a valid partition. All others are "fake" partitions. Let's hop "Super Scan" will came with good result.
My System SpecsSystem Spec
26 Jun 2014   #43
WhyAlwaysM3

Win 7 x64 and Vista x64
 
 

3TB external suddenly becomes 746GB unallocated-capture01.jpg

Key partition/files aren't showing up yet.


My System SpecsSystem Spec
.

27 Jun 2014   #44
Anshad Edavana

Windows 7 Ultimate x64
 
 

Chance for a successful partition recovery seems to be very low at this point. As a last resort before attempting file signature based recovery, please follow the below steps.

1. Download DMDE from Download DMDE Free Edition - DMDE (DM Disk Editor and Data Recovery Software)

2. After accepting the licence, a disk selection window will appear. On the left pane, make sure Physical Devices is selected and then on the right pane choose your slave disk (model name will be showed ). Then press OK.



3. Now DMDE will scan for the presence of boot sectors or backup boot sectors and will present a partition info box like the one in the below example.




Usually it will complete quickly (a few minutes or less than minute ). When it completes, use Windows ssnipping tool to capture a clear screenshot of the Window and post it with next reply. Then proceed to the next step which will take time to complete.

4. Press the NTFS search button. On the next window, choose "Search".



While all other tools searched for lost partitions, this unique feature will search for valid MFT records ( MFT is the structure defining NTFS ) and list found ones.



This will take some time to complete. You will see progress in percentage at the bottom.

5. When the scan completes, press "Save" button and save the log file on a local folder. This will eliminate the need for searching a second time.



6. After saving the log, choose the first found file system and press "Open Volume" button. You will see folder structure like in the below picture. Open "Root" folder and check whether your files are listed.



7. If it is not the partition you are looking for, press the NTFS button on the toolbar and you will be back to the search result window. From there choose second file system and look for your files.

My System SpecsSystem Spec
04 Jul 2014   #45
WhyAlwaysM3

Win 7 x64 and Vista x64
 
 

Followed the steps, finding the same files/partitions that previous programs found. Still not seeing the key stuff I'm looking for.

3TB external suddenly becomes 746GB unallocated-dmde-result.jpg

NTFS 5 and 6 show a single folder [System Volume Information]. NTFS 4 shows nothing in the root.


My System SpecsSystem Spec
04 Jul 2014   #46
Anshad Edavana

Windows 7 Ultimate x64
 
 

In my experience if DMDE can't find a lost file system, no other regular data recovery program will. Whatever caused the corruption, it seems to did it in a very destructive way. A file carving program like "Photorec" might be able to extract individual files but without original name or folder structure.

How important the data stored on the key partition ?.
My System SpecsSystem Spec
07 Jul 2014   #47
WhyAlwaysM3

Win 7 x64 and Vista x64
 
 

Data is important. A decent amount is irreplaceable, but the most important files can be 're-done'. I'd do a Photorec 'blind recovery' and sift through the madness to get it all back.

You're implying I look into professional data recovery services?
My System SpecsSystem Spec
07 Jul 2014   #48
Anshad Edavana

Windows 7 Ultimate x64
 
 

If the data is really important, i will definitely recommend professional data recovery. "Photorec" is powerful but using it is not straight forward.

- It won't recover original file names.

- It won't allow selective recovery of only needed files.

Basically you need to select a source disk and a target location to save the recovered files. "Photorec" will scan the source sector by sector for file types it supports and save them to the target folder.

Step by step guide : PhotoRec Step By Step - CGSecurity

You need another empty disk with enough capacity to save found files.
My System SpecsSystem Spec
Reply

 3TB external suddenly becomes 746GB unallocated




Thread Tools




Similar help and support threads
Thread Forum
Please Help! External HD suddenly became "unallocated"...
My external USB 3.0 HD was working perfectly well yesterday. However, today suddenly became an "unallocated" drive without even a drive name. I'm able to detect the drive but I have no way of accessing it. The only solution that I've tried so far is to access the HD with another computer. But,...
General Discussion
Laptop's built in external hard drive suddenly disappears/unallocated.
Hello! Long story short, my external hard drive suddenly became unallocated. I've seen some youtube guides, posts on other forums, posts on sevenforums, but I can't figure it out -- the solutions for some of these forum posts don't work for me. And so I decided to make a new thread in the hope of...
Hardware & Devices
WD EXTERNAL HARD DISK 1TB suddenly "unallocated" and "not initialized"
Hi guys. I'm new here. I've tried to read all the discussion about how to fix the unallocated hard drive but I just can't understand it as the cases were pretty much different than I'm facing of. Here's my problem. Yesterday my external hard drive seems normal, everything is fine, until...
Hardware & Devices
How does suspicious Unallocated logical partition shows up suddenly?
How does suspicious Unallocated logical partition shows up suddenly? =========================================== I have a black screen during start up issue. I posted a thread (long story). I have Lenovo Z580 Laptop. I did not add any hardware or alter HDD configuration after factory...
Hardware & Devices
WD Red 3TB external HDD showing up as 746GB
Hi all, total newbie so I hope I'm posting in the right place & pls excuse any errors. I've been googling this issue all afternoon and it seems like a common problem, although none of the solutions I've found so far have worked for me, or there were slight differences (e.g. they were using as an...
Hardware & Devices


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 18:30.
Twitter Facebook Google+