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SD and SDHC compatibility issues

During early 2007, the simultaneous availability of 4 GB SD cards compliant with later revisions of version 1.x of the SD specification but incompatible with readers based on earlier revisions of the specification, and of 4 GB SDHC cards, and incompatibilities between SD and SDHC caused confusion among consumers buying memory devices. Several Manufacturers such as Sandisk, Alcotek, Toshiba and Hynix have developed SDHC cards that are now fully compatible with the SDHC SD2.0 specification.
SD and SDHC cards and devices have these compatibility issues :

• Devices that do not specifically support SDHC do not recognize SDHC memory cards. Nonetheless, some devices require only a firmware upgrade.[20]
• SDHC devices are backward compatible with SD memory cards.[20]
• Some manufacturers have produced 4 GB SD cards that conform to neither the SD2.0/SDHC spec nor existing SD devices.[21]
• File System: SD cards are typically formatted with the FAT16 file system, while SDHC cards are typically formatted as FAT32.[19] However, both types of cards can support other general-purpose file systems, such as UFS2/ext2 or the proprietary exFAT for example.

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