Windows 7: Win 7 WD eSATA hard drive crash NTLDR is missing

Had a dual-boot system (Win 7 on drive 1, XP on drive 2) installed. Got an NTLDR is missing error on the primary WD drive on which Win 7 was installed. XP wouldn't boot either because the MBR is on the primary drive. So, I had to reinstall XP and all the software on the 2nd drive and test in original and another computer. Worked fine. When plugged into the motherboard, the Win 7 eSATA drive is not recognized by either of the 2 computers in the BIOS. It won't boot and I can't even look at the drive to see the contents - it's a non-entity as far as Windows is concerned. I plugged it into a Mac with an external eSATA to USB adapter and the Mac saw the drive but said that it was unreadable and asked if I wanted to format the drive. Since I thought I might want to try to recover files, I didn't. Anyway to see the contents of this drive with Windows and recover them or does it seem to be dead from the description?

Go here: WD Support / Downloads / SATA & SAS / WD Caviar Black and download the "Data Lifeguard Diagnostic for DOS (CD)" > Choose the .iso file to download > and burn a bootable CD from it.

Then test the drive with the diagnostic.

The download I linked to is for a Caviar Black SATA drive . If you have a different type of WD drive then go back one page and choose it.