IIRC, that was a problem with specific drives in the 30-40 GB (that size only because that was current in '03/'04) range for the 2400c, 3400c, Kanga, and Wallstreets. OWC had a page about it ages ago, but it's totally MIA now. I gather that all the manufacturers have designs which no longer conflict with the drive controller in those PowerBooks,so any modern drive (built in the last two or three years) should work fine.

Peace,

Drew