According to this thread on 1src, the PalmTX supports SD cards with 8 GB capacity.

The Tungsten E2 was the last PalmOne device with FAT16 drivers. The next one, LifeDrive had a 4 GB hard disk, and due limitations of FAT16 (no partitions > 2 GB), a new driver had to be developed. From then on, all PalmOne devices (except the Z22) had the FAT32 driver which supports - according to Wikipedia - much more than 8 GB. However, not every device could handle cards with “maximum size” (the Tungsten C doesn’t recognize 2 GB cards, the Tungsten T3 has read-only access, …). Because of this you first have to test if such a card works.

To fill a 8 GB card, you need lots of data, for example:

  • 20 movies with appr. 90 minutes in handheld quality (each ~ 200 MB)
  • 7000 JPG photos with 3 MP (2048×1536) (each ~ 0.8 - 1.2 MB)
  • 2000 MP3 music files in good quality (each ~ 4 MB)
  • 80 backup sets of a full TX memory (each 100 MB)

or

  • 5 movies (see above for exact specifications), 3000 pictues, Wikipedia with text and images, 500 MP3 music files, 200 MB Palm database stuff in /Palm/Launcher, 5 backup sets of a full TX memory and still 120 MB free ;-))

That sounds good - but what costs such a fun? A 1 GB SD card starts from 50 EUR, a 2 GB one from 110 EUR and a 4 GB one 270 EUR. And a 8 GB one? Froogle only finds CompactFlash cards with 8 GB, they cost appr. 600 EUR. A LifeDrive is cheaper…

What do you think?