One of my disks used for storage, it contains only store documents and not the operating system or any programs, has become inaccessible. It flags Pri, Act with type description FS: None Partition: 0xE (Fat16 LBA). The disk was originally formatted with NTFS using Windows XP SP2 and has been working without any problem until this happened. It displays the correct amount of space used for data, displayed as Primary and free space is reported as Unallocated. Under properties it reports: File system error: Invalid format. Signature and Blocks is OK. Do I use the tool Recover Partition or Change Type? Convert Partition is unavailable. Edit I do not dear to use, since I do not have the knowledge to tamper with this type of settings. Any respond – much appreciated.