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Windows 7: WD Passport HD 1 TB disk 1 is unknown

15 Nov 2014   #1

Windows 7 Ultimate 32 bit
WD Passport HD 1 TB disk 1 is unknown

Hi Admin,

I'm also facing the same like the rest of em with My WD 1TB external HDD, whenever I connect it, the computer recognizes it's being plugged in, however it doesn't appear in My Computer. When I go to Disk Management it comes up as "Disk 1, Unknown, Not Initialized".

I tried with the Partition Wizard mentioned earlier in the post, but seems it takes lot of time. Data inside the drive doesn't matter for me. If i get it formatted that would help.. kindly advise on how to proceed further.

Also am not seeing the option, New Simple Volume when selected the Unallocated drive.

If Initialize disk is to be done, what partition type has to be selected "MBR or GPT"

Please Help !! Thank you !!

Attached Thumbnails
WD Passport HD 1 TB disk 1 is unknown-disk-1-unallocated-capture.png   WD Passport HD 1 TB disk 1 is unknown-initialize-disk-capture.png  
My System SpecsSystem Spec
15 Nov 2014   #2

Windows 7 Home Premium 32 bit

Welcome onboard.

( I am not Admin but still usurp their address to address this query)

Initialise it as an MBR disk. Only more than 2TB drives need to be GPT disks.
My System SpecsSystem Spec
15 Nov 2014   #3

Windows 7 Ultimate 32 bit


Tried the same, but got this error. WD Passport HD 1 TB disk 1 is unknown-operation-failed.png

Also by browsing further in the site i got to try using the diskpart, selecting the appropriate disk and clean>> ceate partition primary >>

it showed

Virtual Disk Service error:
The Service's cache has become corrupt...WD Passport HD 1 TB disk 1 is unknown-diskpart-capture.png

My System SpecsSystem Spec

15 Nov 2014   #4

Windows 7 Home Premium 32 bit

Unfamiliar territory for me.:)
My System SpecsSystem Spec
15 Nov 2014   #5

Windows 7 Home Premium 32 bit

OK, after looking up a little, I suggest the following.

1. Instead of clean do a cleanall in diskpart. This should hopefully clear whatever data on that disk is stuck in the Virtual Disk cache memory. After completion rescan/refresh. Then create a new volume and format.

2. Instead, if your disk is visible in Partition Wizard do a clean wipe and then format it in Partition Wizard.

3. If both the above does not help, download Partition Wizard bootable CD version, create a bootable CD with that ISO , boot from it and then wipe/format your external drive with it.
My System SpecsSystem Spec
16 Nov 2014   #6

Windows 7 Ultimate 32 bit

Thanks sir for the quick response, tried clean all in disk part... No use of it. Partition wizard Clean Wipe also failed. I wonder whats wrong with it all. But when i tried to Initialize it as an GPT disks rather than MBR disk, it proceeded further. Selected New Simple Volume,.... Assigned Label for the drive and hit on Format. That's it, it worked out.

WD Passport HD 1 TB disk 1 is unknown-magi-hd-dm-capture.png

Will get back if any help is needed, thanks for the help once again !!

My System SpecsSystem Spec
16 Nov 2014   #7

Windows 7 Home Premium 32 bit

That is good but I am surprised.

Whatever, there is no need to initialise /format a 1TB drive as a GPT drive.

It is easier to deal with an MBR disk if and when an MBR corruption or Partition Table corruption occurs and there is a need to repair it.

So I would suggest that you convert the GPT drive to an MBR disk with Partition Wizard.

View your external drive on Partition Wizard, Right click on the leftmost portion where it says Basic, click on "Convert GPT disk to MBR disk" and then Apply.

WD Passport HD 1 TB disk 1 is unknown-16-11-2014-18-13-17.jpg

Note: If you have already put in some data in the GPT drive, back them up before converting from GPT to MBR disk since in the conversion process you will lose all data in the drive.

My System SpecsSystem Spec

 WD Passport HD 1 TB disk 1 is unknown

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