Buffalo Ministation 1TB USB 2.0 Slimline Portable External Hard Drive

I have subject device running from Win7 64 bit.
It's decided to show capacity as 49.5Gb instead of 1Tb.
Any ideas welcomed.
Rick

On the search window type Disk manage. From the options, open "Create and format hard disk partitions"
Expand the Status column so it can be readable.
Take a snapshot of the screen and upload the image.

Ah, I see the prob here. It shows 49.58Gb (healthy active primary partition) and
881.93Gb unallocated.
Should I just reformat at this stage?

Just extend the partition to the end.
If you succeed, please mark this treat as solved.

Success! Thankyou for your help M.

My pleasure to help you.