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Unlike a desktop or notebook computer, a Pocket PC does not have a hard drive. Instead of a hard drive, Pocket PCs use two types of memory chips to store programs and data. The ROM, or Read Only Memory, chip stores the operating system and pre-installed software. The RAM, or Random Access Memory, chip stores data and programs that you input once you've purchased the Pocket PC. RAM has several functional advantages over ROM, but it also requires constant power to maintain its data.

Because RAM memory chips must draw a little power when a Pocket PC is turned off, the battery is slowly being drained even when a Pocket PC is sitting on a shelf. This is why the battery drains completely after long periods without use.

Depending on the type of battery in your Pocket PC, it may take a week or a month of sitting powered off for the battery to drain, but when this happens, the RAM chip no longer has power, and the data stored there is lost. This is called a hard reset.
原帖地�: TechSpott - Computer and technology forums http://www.techspott.com//showthread.php?p=1200

Once your Pocket PC has lost power and a hard reset has occurred, you'll be greeted by a setup screen - the same screen you saw when you turned the Pocket PC on for the first time.

The only way to avoid this data loss is to keep your Pocket PC's battery at some state of charge at all times. If you know you're not going to be using your Pocket PC for a period of days or weeks, just charge it every few days or leave it connected to the AC adapter.

If your Pocket PC has a removable battery, try to keep the amount of time the battery is removed from the device to a minimum as this creates the same set of conditions as a fully-drained battery. You can also perform frequent backups using third-party backup software so that you'll be able to quickly restore your Pocket PC should a hard reset occur.

Note: It refers to Pocket PC 2000, Pocket PC 2002, Windows Mobile 2003 and Windows Mobile 2003 SE Pocket PCs only. The latest versions of Windows Mobile, versions 5 and 6, use a memory management system called Persistent Memory Storage that maintains data even when all power is drained from the battery.