Some Alkaline batteries have a high internal resistance that prevents the battery from supplying the peak currents the card requires for writing. This problem occurs randomly, so you may go for months safely and then suddenly lose all your data. Eveready Lithium Energizers are okay, as are Nickel Cadmium and Nickel Metal Hydride rechargeable batteries if your PDA can use them. Linear Flash Cards are available in 2mb, 4mb, and 8mb sizes. The Linear Flash cards do not have a battery.
All information is stored permanently at the time it is written.
Intel is the leading manufacturer of Linear Flash cards. Each Linear Flash card is formatted differently, although there is a standard for PC cards called Microsoft Flash File format. These cards are compatible with the Apple Newton and Sharp Zaurus, but each has a different format. Other RAM Cards - There are other types of ram cards that were created originally, but are no longer used, such as IDE format cards and Dram cards. These cards are not compatible with any of the current PDAs.