Click to expand.It's the 'Everything worked fine yesterday' part that caught my attention. I assume that you have formatted the card in the camera, but still get the error. If the card mounts, see if you can reformat it in the computer and then again in the camera. Maybe Disk Utility will do this. There could be some corrupted file somewhere. Run Disk Utilities and have it rebuild your Permissions.

Did you install any new software when you got your 5D? Do you have an SD card with photos from you XSi? That might help to isolate the problem. Try a full shut down and restart first. I will be out for the day. Haven't tried a shut down. That's not a bad idea.

As for formatting, yes I formatted both cards, each in a different camera. I also tried formatting one of them with the computer, but that returned an error message. No, I didn't install any new software for the 5D, and I was able to use this card reader to transfer files shot with it yesterday. However, the last transfer was painfully slow, leaving me scratching my head as to why (since the 5D Mark II files aren't that much larger than the ones from the 7D).

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Now I'm suspecting it was because the reader was dying. As for the XSi, it and its SD cards are currently 6,000 miles away from me.

I'll shut down the computer and try again, as you suggested. That's a good idea.

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UPDATE: Restarting didn't help. I think the reader is a goner. Asking the question that has yet to be asked: Did you try a different USB cord?

It's a terminating FW device which means it has to be at the end of a FW daisy chain if you have more than one FW device. (That has zero effect on performance, BTW). It's extremely portable and the CF cards stick out enough that it doesn't need an eject button. I looked long and hard at the, but the eject button seemed too fragile in my mind, and the card goes in far enough that it might take a pair of pliers to pull one out if the plastic eject button ever broke.

Probably just me being paranoid; a side effect of what I do for a living. Also, although it appears you can daisy chain into a series of FireWire devices, the only thing that actually works is another Lexar card reader and they all have to be at the end - strange. Ironically, all my CF cards are Lexar 300x UDMA.:shrug: I have not seen that Hoodman device, but I'm tempted to pick up one of these off-brand as a backup for traveling or for emergencies. The amazon reviews aren't terribly positive. I looked long and hard at the, but the eject button seemed too fragile in my mind, and the card goes in far enough that it might take a pair of pliers to pull one out if the plastic eject button ever broke. Probably just me being paranoid; a side effect of what I do for a living.

Also, although it appears you can daisy chain into a series of FireWire devices, the only thing that actually works is another Lexar card reader and they all have to be at the end - strange. Ironically, all my CF cards are Lexar 300x UDMA.:shrug.

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Click to expand.This works: Mac FW port - External FW drive - CF card reader - CF card reader. This doesn't work: Mac FW port - CF card reader - Other FW device. It has two FW800 ports but the CF reader(s) still have to be at the end of the daisy chain. Weird, not at all how I expect a FW device to work. Either way, the downside is that putting a FW400 drive between your Mac and the CF card reader will slow the card reader to FW400 speeds. (I used that as an excuse for a new, faster external FW800 hard drive!).