Abstract: A detection method for detecting a hot-swapping status of a Secure Digital (SD) card is provided. The detection method includes steps of: transmitting an inquiry command to the SD card at a predetermined frequency when an application requiring the hot-swapping status of the SD card is activated; receiving a current command return message replied in response to the inquiry command, wherein the current command return message includes information indicative of a presence or information indicative of an absence of the SD card; determining the hot-swapping status according to a previous command return message and the current command return message; and replying the determined hot-swapping status to the application.

Abstract: A detection method for hot-swapping of a Secure Digital (SD) card is provided. The detection method includes steps of: transmitting an inquiry command to an card reader at a predetermined frequency; receiving a command return message replied in response to the inquiry command; determining whether the SD card is removed or plugged according to the command return message; and detecting a hot-swapping status of the SD card in real-time to provide an accurate status of the SD card for upper-layer applications.

Abstract: A recovery method applied to the FAT file system in a Linux operating system is provided. The method includes steps of: fetching an FAT chain corresponding to a file; determining whether at least an index entry contained in the FAT chain is valid; and modifying one of the at least one index entry to be valid when the modified entry is examined as invalid. Through the recovery method, FAT files, specifically having FAT chain entries which are invalid or inferring file sizes larger than the maximum length representable by the FAT file system, can be efficiently recovered in the Linux system to minimize data loss as well as to prevent a system crash.