DeMOROlized

Even if SDHC is 2GB, SD readers still can't read it because SDHC spec is simply incompatible with SD readers.

Straight from SanDisk:

The SD High Capacity (SDHCTM) card, miniSD High Capacity (miniSDHCTM) card, and microSD High Capacity (microSDHCTM) card are the new SD™ memory cards based on the SDA 2.00 specification, introduced by the SD Card Association. This new SDA 2.00 specification enables SD cards to reach higher capacities: 4GB - 32GB*.

Because SDHC, miniSDHC, and microSDHC cards are recognized by new SDHC, miniSDHC, microSDHC host devices differently than standard SD, miniSD, and microSD cards, they are not backwards compatible with legacy SD, miniSD, and microSD format host devices. Standard SD, miniSD, and microSD cards are forward compatible with new SDHC, miniSDHC, and microSDHC host devices.

DeMOROlized

4GB SD works fine. SDHC of any size will not work.

Boston Driver

...if it is anything like the RNS-E SD card setup, it is not necessarily the size fo the card, but the NUMBER of "items" on the card (song files and folders each count as one item). I believe the limit is 512 "items"

Also, the RNS-E SD card setup has a limitation of 64 characters in a song title (the system won't simply truncate the song title, but won't display the song at all) and if there are any "special" characters in the song title, the song will not display.

I have two 2GB SD cards, each with about 35 albums on them....and it rocks!