Chris Mauritz wrote: > centos at 911networks.com wrote: >> Hi, >> >> I am trying to read a 4gb SD HD card class 6 [hispeed], and Centos >> 5.1 does not recognize it. >> ... >> Any suggestion? >> > > My understanding is that the HSSD/SDHC cards have somehow changed the > methodology of how the cards are formatted (or somesuch). indeed, the SD specification has a 2GB max physical limit, SDHC (SD High Capacity) changes how the registers are used to allow larger cards. This is somewhat akin to how the ATA/IDE spec had to be extended over and over to support ever larger disks, most recently the LBA48 spec to get past the 128GB wall.