Disk Management Problem

[Teeravee Sirinapasawasdee]

I have moved my hard drive from my computer to my friend's
computer. My hard drive is dynamic disk which contains
only 1 dynamic volumn. After I have pluged it, I open Disk
Management to import it to my friend's computer but I have
clicked in wrong command that is "Convert to Basic Disk".
After that the Windows say my hard drive is unallocated.
It contains a lot of my critical data. How can I recover
it back? Do I need another software to recover the data?

Thank you,
Teeravee Sirinapasawasdee