Hi Amarjeet and welcome,
Have a look at the default account policy's here, I have a feeling that there's a lock out policy for drives not formatted in Win 7 (or something like that):
Type gpedit.msc to open the group policy manager. Navigate the tree to
Local Computer Policy\Computer Configuration\Administrative Templates\Windows Components\BitLocker Drive Encryption\.
Look at both FIXED and Removable drives as I'm not sure how windows differentiates the sata drives.
With the other drives, it's always best to freshly reformat them in windows 7 as NTFS before applying bitlocker encryption. So check this as well.
Let me know if you are successful. Meanwhile I'll try to find a technet article that I read a few months ago with a lot of bitlocker help and post it up for you to read.
-Timo
EDIT: Here's the link to the technet step-by-step guide.
http://technet.microsoft.com/en-us/l...65(WS.10).aspx