"Disk 1; dynamic; unreadable"

Hello:

On my PC, I used to have a 40 GB HDD (Disk 0) partitioned
in to Drive C and Drive D. Drive C had Windows XP O/S and
Drive D only had data. I bought a new 160 GB HDD,
installed it as a slave drive, and then transfed all data
from drive D into it. After the data transfer, I was able
to see and work on all my data on the 160 GB drive. I
decided to re-installed Windows XP on the old 40 GB drive
which was formated in NTFS. After installation, I could
not see the 160 GB drive. The dish management utility
shown that the 160 GB drive was dynamic and unreadable.

Wish somebody would know how to make the 160 GB drive
visible and readable again.

Many thanks
-Son Dinh