Welcome to the forum, mrfed
T43/p and R52 series ThinkPads are very picky about the drives they'll work with. Long story that has to do with their SATA bridge...
What Seagate drive have you installed?
Are you getting the "2010 error" or is the machine not seeing the drive at all?
Good luck and let us know.
Cheers,
George
A31p (2653-???) P4M 2.5/2GB/250GB, 15" UXGA IPS, XPP/Mint ...the best ThinkPad ever...
T43pSFL (2668-BY8) PM 2.2/2GB/32GB SLC SSD, SATA-modded, 15" LED-AFFS UXGA mod, Win 7/Mint...my best friend...
R60F (0657-???) C2D 2.0/3GB/128GB SSD/ 15" SXGA+ IPS, Win 7...a FrankenPad toy for my twin boys...
T410 (2537-RB7) Core i5 2.4/8GB/128GB SSD/14" WXGA+ TFT, Win 7/Mint...just grabbed by my only daughter...
Z61m (9450-38U) C2D 2.0/4GB/500GB/15.4" WSXGA+ TFT, Win 7...my wife's new best friend...
...plus an iPad 2...and a ToughBook...or two...
I build FrankenPads....scary FrankenPads...
S = SATA-mod (on T43/p units only)
F = FrankenPad
L = LED-mod utilizing an UXGA AFFS LED screen
Please DO NOT PM me with requests for individual support, but post your questions and concerns in the appropriate section of the forum where other users can benefit from them as well. Thank you.