Bart's Stuff Test 5.1.4 Description:
File level support enables you to test any local or remote volume by file access. This makes it possible to test almost any storage device. As long as the operating system can write or read files from it, you can use bst5 to test it. In Bst5 this is seen as a "high" level test, you write/read data to/from a file using the file system support from your operating system.
Device level support enables you to test local devices directly block-by-block. You can use this to test any removable or fixed logical drive, physical hard disk, or tape device. In bst5 this is seen as a "low" level test, bst5 writes/reads data directly to/from the storage device without the use of any file system. In other words, the storage device or media does not need to be partitioned or formatted before testing. If any file system exists on a storage device or media, a non-read only test will overwrite any data on it.