ResMed memory card

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Ok, looks like the problem was a bad memory card. Don't know the brand or quality of the original one supplied with the machine. Installed a good one I use for shooting video and the machine instantly formatted it and downloaded all the current data including the data from last week that was missing. Thanks to everyone for their replies.

I'd point out that ResMed, on their website, makes a rather big deal of telling us that anything other than a card supplied by them won't do. My card failed early and I used another one for a month or two with no problem until I got resupplied with a ResMed approved one.

The thing is, that should your machine fail during the warranty period and while you have a non approved card in the machine, they just might use that as an excuse not to honor their warranty.

The ResMed web page looks to me like a concern with regulatory issues about spacing between the patient and electrical circuits in medical equipment. Certain spacing and other things are required for regulatory requirements. If they told you you could use just any card, they'd have to do some more paperwork, and maybe some design changes that wouldn't really affect safety.

Of course, the general desire to have you buy supplies only from them is probably there, too.