You can't trust the Windows installer in this case. Please get the BIOS to ID the drive.
I recently purchased a new 40GB Scorpio EIDE 5400 RPM 8MB Cache Notebook Drive from Western Digital for my Dell Inspiron 5100 notebook. When placing the Windows CD in the drive, it ends up giving me a stop error (0x0000007f) before any options appear. I know that this is a hard drive error but I don't know how to fix it. The BIOS says that it doesn't recognize the drive but apparently the computer recognizes it since it gives the stop error. I'm almost positive that the drive is compatible because the Dell website recommends the 160Gb version of the drive.