Disk Signature Collision Problem:-
To remove disk signature collision problem please use below steps on windows 7 command prompt:-

• open command prompt as an administrator
• type diskpart
• then type list disks . It will show you details of physical disks.
• To view signature of disk type select disk a1. Where a1 is the number of disk which you have got from list disks.
• Type uniqueid disk. It will show you disk signature a hexadecimal number.
• Now type uniqueid disk ID = Signature. Where Signaute is new hexadecimal number which you want to provide this disk.
• Type exit to close diskpart.

Signature chage is done.