Convert RAW to NTFS in Windows XP?

After power supply failure, replaced HD and moved “damaged” HD to slave position. Disk Management shows it “Healthy, Active and Online”. Master HD shows file system “NTFS”, Slave shows nothing under “file system”. “Local Disk Properties” show “File System: RAW”. How can I convert primary partition in slave drive to NTFS without formatting, as all my original data is in that partition? Thank you in advance!