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Flash ROM is generally not writable and is where the operating system and main files are stored. In the event of power loss, information in the Flash ROM is preserved. There are programs available by Brayder technologies (www.brayder.com) to release unused portions of the Flash ROM and copy programs of your interest there. This frees up valuable RAM space and secures programs in event of power loss. |
RAM is where the bulk of you applications lie. RAM is volatile memory and requires a constant power supply. If the battery is disconnected or runs out of power, you will loose all information stored in the RAM. Older models of Palms provide 8 mb (megabytes) of space; new models are offering 16 mb of space. RAM is like Manhattan real estate - its in prime location and very very valuable. |
Expansion memory adds the ability to store mass amounts of data that can be access by programs. Unlike RAM, expansion memory does not require a constant power supply, and thus data is preserved despite a connection to a constant power supply. Palm devices use the SD/MMC card, Sony devices use the Memory Stick, and Handera devices use Hagiwara and Compact Flash. Handera devices have 2 slots and use both Compact Flash and SD/MMC.
In general, all PalmOS devices access the expandable memory via VFS (virtual file system) which was introduced in PalmOS v4.0. VFS is the instruction code that treats the expandable memory like a removable hard drive. The expandable memory therefore is organized with a directory structure much like that found on your hard drives at home. Knowledge of the directory structure and what's "recognized" will enable you to fully take advantage of your PDA.
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