[CentOS] SD cards
John R Pierce
pierce at hogranch.com
Tue Dec 4 23:03:47 UTC 2007
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.
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