Keith
The best camera is one that still works!
I have just dusted off my Sigma SD1M with the intention of using it again after several years of storage. Back when I had my D700, which also used CF, I had issues reading cards on my iMac ... sometimes they would open and occasionally not but disconnecting and reconnecting the reader would eventually open them. Then it got to the stage where I couldn't get the reader to work at all and as I no longer had the Nikon I put the SD1M aside and gave up on it. Maybe the reader is kaput but I couldn't get a friend's one to work either when she was here with her Cannon which also used CF ... she had her reader with her but like mine it wouldn't open on the iMac. The computer is fine, the card reader for my D4 Nikon works perfectly and I have no trouble with SD cards. I'm thinking of getting another card reader but would appreciate some advice on this problem ... is it common for the Mac to be so fussy with CF card/multi card readers?