I have a 2.2 gig hitachi microdrive and it is slow when it comes to burst mode.
It was pretty bad with the D60 at 3.5fps.
Now with the 1D it is pretty painful with 8.5fps.

I will be buying two or three of the high end sandisk ultra 2 gig CF cards from Costco for around $70 each. For now I'm using a 512 CF sandisk Ultra card.
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http://www.picturetrail.com/O1SalsaX <-----UPDATED 8/2/06

I got "IT" from ebay.
Now it burns when I pee..