Storage Solutions Logical Partitions Gone

[GuruGulabKhatri]

Today Morning My WD 1TB Drive's Logical Partitions are Not Showing.It Shows as unallocated Space in Windows Disk Management.
Have I Lost all the Data?
Please Help

 

[drsingh]

use clone zilla,parted magic live cds to view and trouble shoot partitions. hiren's bootcd is another good option

 

[vivek.krishnan]

Before doing anything to the disk, if possible try to do a complete RAW backup of the drive. Afterwards proceed with using any recovery software, ideally on the RAW image.

Alternatively, you can do a chkdsk on the drive directly, it may be useful to retrieve the files, but they will be in a single folder, without partitions.