On Wed, Aug 23, 2006 at 12:23:05PM +0200, Thibouille wrote: > > Also SDHC is incompatible with SD: of course SDHC uses now FAT32 but > that's not the only difference. Even high capacity SD are not > compatible with some readers.
SDHC is perfectly compatible with SD - that's why it was chosen. Of course that doesn't mean an arbitrary SD implementation will be able to read SDHC - there were several (mutually incompatible) extensions made to SD to get over the 2GB limitation, and these use fields that were undefined in the original SD specification (much as several hard drive manufacturers came up with their own way of extending ATA/IDE beyond 128MB prior to the EIDE specs). If your SD firmware or software doesn't allow access to those additional fields, or uses them in a different way from that in the SDHC specs, then you're not going to be able to use SDHC cards in your SD device. But the reverse (using SD cards in an SDHC-compliant device) is required to work. That's why Pentax have been able to promise that the K100D will work with both SD and SDHC cards with only a firmware update. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
