I recently bought 4 4 gig SD cards (4-pack) at Wal-mart for a friend for 16.99 CDN
They work fine on her PRS 600.
She is worried that her antique laptop is dying and wanted backups of her ebooks.
I put approximately 1100 books on each using XP and had no problem with the send to device from Calibre or Calibre reading from the device. (lots of room to spare on each card)
The downside is that it takes a while for the PRS 600 to start up with that many books, but she is happy.
I did not format the cards or notice what format they used but page turns did not seem slower.
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