SDHC (Secure Digital High
Capacity, SD 2.0) is an
extension of the SD standard
which increases card's
storage capacity up to 32 GB.
SDHC cards share the same
physical and electrical form
factor as older (SD 1.x) cards,
allowing SDHC-devices to
support both newer SDHC
cards and older SD-cards. To
increase addressable storage,
SDHC uses sector addressing
instead of byte addressing in
the previous SD standard.
Byte addressing supported
card capacities up to 2GB,
whereas sector addressing
can theoretically support
capacities up to 2 TB (2048
GB). The current standard
limits the maximum capacity
of an SDHC card to 32 GB. (It is
expected that the SDHC
specification will be revised
in the future to allow card
capacities greater than 32
GB.) SDHC cards will not work
in devices designed to the
older SD 1.x specification.
The SDHC trademark is
licensed to ensure
compatibility.
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