Just buy WDMarvel and you will be WAY BETTER (unless you need WDC Cyl16/32 support and SD tool SUCKS on those old drives anyway....)
Example of SD WD doctor not working as it should on old cyl16/32 WDC drives -
http://www.hddoracle.com/viewtopic.php?f=91&t=1939If you need pc3k/MRT alternative for WD drives follow this advice :
Newer WD drives (ROYL and MARVELL) BY ALL MEANS get WDMarvel. Try it out. To refurb (ARCO and SS) use SeDiv.
For old CYL 32 and 16, WDxA and WDxB by all means get HRT.
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