The master file table record consists of a header and the attribute list. It has a size of 400 (=1K). The header has the following fields:
offset(length)   contents
0(4)             Magic number 'FILE'
10(2)            Sequence number
20(8)            Main MFT record, if continuation record, or 0
2A(6)            Fixup
30               Attribute list
The fixup's first word should be found at offsets 1FE and 3FE. If it matches, the words at offset 2C and 2E should be written to the offsets 1FE and 3FE, respectively.

The attribute list is of variable length and terminated with FFFFFFFF.