WD external hard drive won't run in any PC.. Help!

[Lazyann]

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i have this 1 terra WD external hard drive for around 1 year already and it worked perfectly fine until 2 days ago it suddenly won't run in my laptop or any of the PCs i've connected it with. but the hard drive is recognized, it just won't appear in my computer with a corresponding drive letter.

I've tried switching the cord with another similar WD 1TB HDD's cord but it still wont work so the cord isnt the problem.

I also tried going to disk management, i can view my harddrive in it but it says it is unallocated and if i click initialize disk, a dialogue box saying "the media is write protected" and so i couldn't access it there..

any ideas on how to fix this or advice on what i should really do?
can my files still be recovered?

thanks!!!

[Lingaw-lingaw_sa_payag]

mu appear xa sa computer management?

[oneshot23]

try google sir naa daghan cases ani nga na solved na nakasuway ko ani its either e change nimo ang drive letter or naay kay kutikutihon sa regedit ^^.

[Lazyann]

mu appear xa sa computer management?

yes it appears as disk 1, looks like this:

[Fafnir]

@Lazyann: daot na ang file system ana i.e. corrupt and needs formatting...naa kay kinanglan na data ana? if naa, try ug gamit testdisk para irecover imo files nga kinanglan, then reformat daun.

[Lazyann]

i see. yes i have many important files in it. where can i dl test disk?

[renlan]

here:
TestDisk - CGSecurity