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: External HDD became unallocated

06 Jun 2015   #11
gregrocker

 

3tb is Unallocated meaning it has no partitions now. If deleted then you should first try from boot Partition Wizard CD running exactly as shown here the Partition Wizard Partition Recovery Wizard - Video Help.

It cannot recover the missing partitions then test the hard drive with the maker's HD Diagnostic extended CD scan.

You can also attempt to recover your data using Test Disk or free Recuva - Features

The first two hard drives have EFI OS installations. Are you still using both?

The third hard drive has an Active partition that needs to be Modify>Set Inactive by Partition Wizard because only an MBR OS boot partition should be Active.


My System SpecsSystem Spec
.
06 Jun 2015   #12
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

Thank you Greg for coming to help.

chummy just follow Greg's instruction.
My System SpecsSystem Spec
06 Jun 2015   #13
GokAy

Windows 7 Ultimate x64 SP1
 
 

Try PhotoRec to recover files, maybe it will help. TestDisk Download - CGSecurity
My System SpecsSystem Spec
.

06 Jun 2015   #14
chummy

Windows 7 Ultimate x64
 
 

Thanks for all, i will try recuva now.

Edit: Recuva dont read unallocated drives, so not helping for this case.
My System SpecsSystem Spec
07 Jun 2015   #15
chummy

Windows 7 Ultimate x64
 
 

Just to clarify, i used partitionguru and it recreated my 3 partitions with all files intacts there.

I only wanted to know why windows/HDD deleted partitions after i changed from USB to Sata, to avoid such problem in future.
My System SpecsSystem Spec
07 Jun 2015   #16
jumanji

Windows 7 Home Premium 32 bit
 
 

Quote   Quote: Originally Posted by chummy View Post
.....I only wanted to know why windows/HDD deleted partitions after i changed from USB to Sata, to avoid such problem in future.
In simple terms, your 3TB external drive used Advanced Formatting with 4096 bytes/sector with eight conventional 512bytes/sector combined. During the read/write process the firmware inside the enclosure translates the data appropriately to be read and written correctly.

"during the read process, the Advanced Format hard drive loads the entire 4096-byte sector containing the requested 512-byte data into memory located on the drive. The emulation firmware extracts and re-formats the specific data into a 512-byte chunk before sending the data to the host."

Similar translation process occurs when eight 512byte/sector data sent by the host is combined into 4096bytes and written to the HDD.

When you took out the HDD and made it as an internal drive this drive translation by the firmware inside the enclosure is lost. Your drive is unreadable to the host.

Now immediately after seeing that you were not able to read the data when you made it an internal drive, had you returned it to the enclosure everything would have been fine.

But it would appear that you had mucked it up trying so many things. My head just twirls reading this thread.

Anyway now that you have returned it to the enclosure, let us see what Partition Wizard sees.

Post the first screenshot after launching PW. Then run Partition Recovery Wizard Quick Scan. When it completes post the screen showing found partitions.
My System SpecsSystem Spec
07 Jun 2015   #17
gregrocker

 

Windows will not delete partitions on the drive. You have to do it yourself. If there are problems with the hard drive however then the partitions could be affected. Test the drive with the maker's HD Diagnostic once you have seen if you can retrieve the files with suggested recovery tools.

Did you use the unknown partition manager after this happened? If you partition over the data then it will not be recoverable.

In the future I suggest Partition Wizard which we've used in tens of thousands of complicated partitioning operations here without a single problem. The boot disk is safest. All other partitioning managers can fail with data loss except Disk mgmt and PW boot disk.

Follow Jumanji's guidance above as he is very good on this.
My System SpecsSystem Spec
07 Jun 2015   #18
chummy

Windows 7 Ultimate x64
 
 

Let me be specific, i have 2 computer, primary running windows 8.1 in GPT UEFI which i used always the External HDD.

In the secondary PC where i was to use the External HDD in internal it runs win7 x64 in MBR BIOS mode. When i plugged first time there the External HDD via USB it worked fine reading 3 partitions same like PC1. Then i removed case and plugged the HDD internally in win7, when come to see in my pc there was no partitions aside the ones from the primary HDD.

I entered the disk manager and it pops option to choose MBR or GPT for disk 2 and i selected MBR. But there inside disk manager it just shows 3tb HDD running internally being unallocated 2tb+700gb spaces.

So after that i started worrying and grab the disk back to PC1 win8.1 internally via SATA to try out and keep same unallocated thing. I pluged it back via USB again in PC1-win8.1 and used Partition Wizard to try recovery partition. After it find 3 partitions right in the last round when clicked to apply to recovery the partitions then Partition Wizard just stopped working(crash) while recoverying partitions(tried 3 times and same crash).

With PartitionGuru running HDD via USB it find the 3 lost partitions, show me all files there and i copied all files to my other drives to backup. After that i clicked "Save partition table" to try recover the partitions and Partionguru recovered 3 lost partitions with all files there running the HDD via USB.

So now i tried to go again to PC2 win7 running the HDD internally via Sata2 but again it messed up HDD, but now a bit different. It read 3 partitions without specifics sizes and cannot access them, inside disk manager it show some strange partitions sizes. Then i bring back the HDD to PC1 via USB and here it read 3 partitions fine without problems like happened yesterday when become unallocated even when bring back to USB.

I just want to use the HDD in this PC2 but try avoid formatting if possible. Is there some way to make it happen? I just dont know what is messing up to use it internally in the windows 7 PC.
My System SpecsSystem Spec
07 Jun 2015   #19
chummy

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by jumanji View Post
When you took out the HDD and made it as an internal drive this drive translation by the firmware inside the enclosure is lost. Your drive is unreadable to the host.

Now immediately after seeing that you were not able to read the data when you made it an internal drive, had you returned it to the enclosure everything would have been fine.

But it would appear that you had mucked it up trying so many things. My head just twirls reading this thread.

Anyway now that you have returned it to the enclosure, let us see what Partition Wizard sees.

Post the first screenshot after launching PW. Then run Partition Recovery Wizard Quick Scan. When it completes post the screen showing found partitions.
Only way to me use it internally in SATA then is formatting the HDD?

Running via USB:
External HDD became unallocated-hd-no-pw.png

External HDD became unallocated-hd-no-pw-2.png


My System SpecsSystem Spec
07 Jun 2015   #20
jumanji

Windows 7 Home Premium 32 bit
 
 

OK, the present situation is that you have recovered all data in that external HDD into another HDD. Yes/No. I just want to double confirm it.

If your answer is Yes, then what prevents you from formatting it as an internal drive on your Windows 7 PC? Any reason why you do not want to format it?

Of course you have to initialise and format it as a GPT drive. You may also create the 3 partitions and then copy all data into it.

This is going to be the ultimate solution. But hold on.

Try the following.

Install AOMEI Partition Assistant on your Windows 7 PC.

Hook up the HDD removed from the enclosure as a second internal drive on your Windows 7 PC.If Windows asks you to initialise it say no and cancel it. Do not initialise.

Run AOMEI Partition Assistant. Does it show it as an MBR drive?

Right click on the disk icon > Convert to GPT Disk > Apply

External HDD became unallocated-08-06-2015-02-39-20.jpg

Once the conversion is completed, reload the Properties when prompted. Are you able to access the partitions with all data in it?

If it does, well and good.

If not you have to go to the ultimate solution - initialising and formatting it as a GPT drive.( Do this only if you had recovered all data in it already)


My System SpecsSystem Spec
Reply

 External HDD became unallocated




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
How do i fix unknown, not initialized and unallocated external hd?
Please help me fix this problem. any information you need just ask me i will tell you all you need. Thanks in advance
General Discussion
HELP! My External Hard Disk is unallocated!
I'm new here, and pardon my english. I'm totally panic, I was backup my files to my TOSHIBA Ext.HD (500GB) a while ago, and suddenly my HD said it need to be format so the HD is function again, kinda... Well I don't want to loose all my data, at first I try to command prompt and use "chkdsk...
Hardware & Devices
External HDD Unallocated 2047.35gb other Sol'n?
Hi and Hello :D I have a 500gb HP External HDD then one day 2047.35gb showed up -I tried disk part -disk management, -thumbscrew, -Power data recovery(partition explorer does not show up), -PhotoRec(Still None) D:
Hardware & Devices
How do i fix unknown, not initialized and unallocated external hd?
Please help me to get my important data from my bad hard disk, I have a segate 500 GB usb external HDD, It was working fine since last 3 years. yesterday i connect this to a XP machine, and start coping some data. the coping speed was very slow, so I restarted the machine in between. After that...
Hardware & Devices
My external hard drive is unallocated
Hi guys, I was checking for errors on my WD HD the other day due to low speed and leave it alone but my mother unplug it inadvertently! Clearly it's unallocated now. I've read a lot of posts especially those sent by jumanji (Windows 7 Help Forums - View Profile: jumanji) and apply almost all...
Drivers
External drive was readable, now it is unallocated?
Hi all, The situation is fairly simple. This morning I : 1: Unmounted and unplugged my external drive which is a WD My Book Essential 2TB 2: Took it to a colleague and tried to connect it to his IMac4 which has OS X 3: Nothing worked, we could see the drive but couldn't access it even with...
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 07:10.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App