Storage cards are susceptible to errors. Over time, clusters can become corrupted, part of files can become lost, and a range of other errors can occur. You should take the time to run ScanDisk to monitor the health of your storage cards and repair any issues found, especially if the number of files and applications are growing and your system is getting old - it may save you from a whole lot of lost data in the long run.
File system errors are the number one reason for data corruption and loss of important files and data on your Windows Mobile device. Every time a program locks up or you soft reset your Windows Mobile device because an application stopped responding, there is a risk of introducing errors on your storage card. If the mobile device is interrupted while writing information on the storage card, the resulting data is often incomplete. Most often this happens because the operating system is not able to update the FAT tables or the file chains because of the lock up/soft reset. No matter what the potential cause may be, it is quite possible that lost clusters and/or chains are on your storage card. A lost cluster or chain is data that is “lost” and cannot be accessed through the file system. This can also cause random lock-ups or application errors.
If ScanDisk is not performed on a regular basis your device may become sluggish in performance. ScanDisk is one of the essential tools used to maintain performance and error-free file management.