Recover data from slaved Western Digital drive

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This drive did not fail; but my primary drive did. I received several Blue screen errors on Windows XP Home. They referenced the primary drive failure. I tried to reinstall windows and without realizing it, when I installed from the cd, my primary drive had failed and I overwrote the FAT table on my drive. When I realized what had happened, I aborted the installation. Now I have the drive replaced and want to recover the data on my 2nd drive.