"I use an IBM 1 gig Microdrive with my DSLR. I get 318 photos of about 3 mb each in JPG Fine mode. It's plenty enough for a day's shooting at the style I shoot.
If I was taking serious photos I would probably have multiple CF cards or microdrives for redundancy. I believe any card smaller than 256 mb would be a poor choice for a DSLR."
IBM just extended the warranty period for an additional 6 months for the microdrive. (Wonder why...?) I have 6 of the rascals and they are not consistently reliable on my Nikons - they get too hot and die, or the images just aren't there when you go to download them into the computer - I think this is caused by overheating also. If I'm leisurely shooting (not more than 3 shots a minute) in an AC environment there isn't a problem with their reliability unless I crank up the shooting speed.
I suggest trusting 512mb cards. The card is quicker than the microdrive and has been 100% reliable for me. I have to download the cards frequently into the laptop or I forget which card has what images, and I don't like using the camera to search the cards for an image.
I shoot Nikon's proprietary, "nfs", file format and convert that to a tiff file for the Photoshop artist. If I was shooting the Pentax I'd recommend the tiff file format.
