WD My Book 3Tb - becomes as 800Gb

Portable Drives My Passport
1

Brand new WD My Book 3Tb. I’ve wrote about 1.5Tb media-data and connect to ASUS DSL-N55U via USB. After data indexing, ASUS DSL-N55U shows WD My Book 3Tb as 800Gb disk, and about 700Gb media-data were lost. Now when I’ve connected WD My Book 3Tb to PC, I see only 800Gb disk space.

BUT

DISKPART> detail volume

Disk 3 Online 2795 GB

Volume Capacity : 747GB

Volume Free Space : 4978 MB

So - DISKPART sees the disk as 3Tb, but with volume only 747GB.

Technical’s Gurus - who can understand what’s up with my 3TB disk?

And how to recover the disk (and how to avoid such surprise in future?)

Thanks,

CA

2

First up check to see if you have a UEFI BIOS.

next check the partition on you drive make sure it is a “GPT disk”

to check right click on my computer>manage>disk manegement

then right click on the disk where is says disk 1…and a graph. try to convert to GPT. remeber to back up first.

3

Hi Gazzi,

What does it mean - UEFI BIOS?

What I have to check in the BIOS?

Regarding “GPT disk” -

No  - the disk is mark as MBR Disk. And what is more - I worked with this disk during about the week (when the 3Tb disk was connected directly to my notebook Sony VGN-Z530N). No errors with this MBR Disk. But when I’ve cinnected the disk to the ASUS WiFi ADSL N55U - the disk format was corrupted and part of my data were lost.

So the first question - how to restore the original (3Tb) disk format?