The name of the filesystem in use on this partition, if it is known.
Possible values of interest include "HPFS", "JFS", "FAT12", "FAT16", "FAT32", "NTFS", "UDF", "CDFS", "Linux" and "????".
In addition, certain filesystem names may have the string "-H" appended to them, which indicates that they reside on partitions which have been 'hidden' by Boot Manager. ('Hidden' in this context simply means that a primary partition has been temporarily marked by Boot Manager as inactive, or not currently booted, in the partition table. It should not be confused with the separate concept of hiding a volume.)
Note that there is an error in the current OS/2 implementation which causes partition type 0x83 (Linux native) to be reported as "????" while type 0x82 (Linux swap) is reported as "Linux".