Erasing is an operation that setsĪn entire range of memory, called an erase block, to all 1s. Once a bit of memory has been changed to 0, it can't be changedīack to 1 except by erasing it. Instead changing bits of memory to 0 or 1 depending on the dataīeing written, flash memory can only change a bit from 1 to 0. The biggest limitation of flash devices is how they're written. #PS2 MEMORY CARD PS2#PS2 uses to talk to memory cards isn't capable of 10 Mb/s, actual By comparison, the transfer rate for reading randomīytes is much slower, only 40kb/s. Similar to how a hard drive is organized into sectors.įor example, with the TC58V64AFT, a flash device used in PS2 memory cards,Īn entire 528 byte page can be read at a sustained 10 Mb/s For this reason NAND flash memory is organized in to pages, After the firstīyte is read, each subsequent byte takes only about 50 nanoseconds Reading the first byte ofĭata from a flash device takes about 25 microseconds. While much faster than hard disk, NAND flash is much slower than One of the limitations is a relatively slow random access time. Which affect how the PS2 uses its memory cards. However, flash memory does have number of limitations Since it's non-volatile, meaning itĭoesn't need power to retain data, and reprogramable, meaning theĭata stored can be changed, it's the ideal form memory to use in Understand some of the basics about this kind of memory works.įlash is a non-volatile form of memory that can be electricallyĮrased and reprogrammed. Since PlayStation 2 (PS2) memory cards use NAND Flash it's helpful to superblock The first page on the memory card where important informationĪbout the structure of the file system is kept. programming The operation of changing erased bits on a flash device from 1 to 0. On the flash device used in the memory card, and is analogous page The basic addressable unit on a memory card. half A two byte unsigned half-word value. erase block The basic erasable unit on a memory card. A means of encoding data so that randomīit errors can be detected and corrected. cluster The unit of allocation used in the file system. Memory cards, so I've created short glossary.īlock See "erase block". A number of terms are used in this document that you may notįamiliar with or are different from other sources describing PS2
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