Different types of memory sticks
Memory stick PRO
The Memory Stick PRO was developed in 2003 as a joint effort between Sony and SanDisk. Many devices that use the original Memory Sticks support both the original and PRO sticks since both formats have identical form factors. Memory Stick PROs have a higher transfer speed and a maximum theoretical capacity of 32 GB.
Memory stick Duo
The Memory Stick Duo was developed in 2003 in response to Sony's need for a smaller flash memory card for pocket-sized digital cameras, cell phones and the PlayStation Portable. It is smaller than as compare to Secure Digital (SD) format. Memory Stick Duos are available with the same features as the larger standard Memory Stick, available with and without High Speed mode, and with and without MagicGate support.
Memory stick PRO Duo
The Memory Stick PRO Duo (MSPD) quickly replaced the Memory Stick Duo due to the Duo's size limitation of 128 MB and slow transfer speed. Memory Stick PRO Duos are available in all the same variants as the larger Memory Stick PRO, with and without High Speed mode, and with and without MagicGate support. In March 2008, Sony released a 16 GB version of the Memory Stick PRO Duo. Sony released a 32 GB version on August 21, 2009.
Memory stick PRO HG-Duo
On December 11, 2006, Sony, together with SanDisk, announced the Memory Stick PRO-HG Duo. While only serial and 4-bit parallel interfaces are supported in the Memory Stick PRO format, an 8-bit parallel interface was added to the Memory Stick PRO-HG format, transfer rate of 480 Mbit/s (60 Mbyte/s) is achieved, which is three times faster than the Memory Stick PRO format.
Memory stick Micro M2
SanDisk and Sony released a new Memory Stick format on February 6, 2006. The Memory Stick Micro (M2) measures 15 × 12.5 × 1.2 mm with 64 MB, 128 MB, 256 MB, 512 MB, 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB capacities available. The format has a theoretical limit of 32 GB and maximum transfer speed of 160 Mbit/s.
Memory stick XC
On January 7, 2009, SanDisk and Sony announced the Memory Stick XC format (tentatively named "Memory Stick Format Series for Extended High Capacity" at the time).The Memory Stick XC has a maximum 2 TB capacity, 64 times larger than that of the Memory Stick PRO which is limited to 32 GB.
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