SD Card for ResMed AirSense 10 Elite

[Lowhypopnea]

Does anyone know if I need a special SD card for my ResMed AirSense 10 Elite.
The label on the SD Card I have says:

SD
HC
ResMed

Putting the card into my computer reveals it is 3.69GB and FAT32.

Can I get an extra SD HC card and format it to FAT32 and copy the original to the new one?  Will the ResMed machine be able to handle a 8, or 16 GB SD card if I upsize it??

Along with that I saw on the internet a HC1.  Does that mean there is also an HC2???  Does it matter?

Thanks

[Crimson Nape]

SD cards come formatted to FAT32 by default.  You can use any SD card from 4Gb to 32Gb without any problems.  The design of the A10's system limits the maximum addressable area in a card to 4Gb.  This means that you can use a larger capacity card but the Resmed will only use 4Gb of it. Nowadays, it is difficult to find a card as small as 4Gb. Look for the best value. You can purchase SD cards from many places, including drugstores or big box stores.