The Memory Stick is Sony's brand of flash memory; originally released in 1998, Sony has stuck with the Memory Stick for expandable memory in their set of handheld devices, including digital cameras, camcorders, the PSP systems (including the PSP Go) and the brief foray into the hand-held market with the Mylo.
The original Memory Stick was about the same width and thickness of the standard SD card, but about twice as long; this card came with either 4 or 8 megabytes of space. In 2003, the faster and larger capacity Memory Stick PRO was released, though it was only another year before the Memory Stick PRO Duo was released. The PRO Duo is the current adaptation of the Memory Stick, with capacities that go up to 32 GB.
The Memory Stick allows you to expand your PSP memory; you can play games, video and music directly from the flash memory, without ever copying the data onto your system memory. This allows you to use multiple memory sticks to manage data or to simply store everything on one large Memory Stick. Memory Sticks are sold separately from the PSP.
The PSP Go uses the Memory Stick Micro for expandable memory. The Memory Stick Micro can be used in your PSP using a PRO Duo adapter. Because the PSP Go only distributes games by download, the Memory Stick plays a large part in the portability and use of the games you download. Games are compatible between the PSP and the PSP Go.
You can use your Memory Stick to transfer data (such as music, video and images) between your computer and your PSP. While the Memory Stick isn't the most common of the flash memory types, most card readers have a Memory Stick slot available. You can also purchase a USB card reader for your Memory Stick, if your computer does not have a slot available.
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