FUJITSU MHV2120AT - Manual (Page 138)

Interface
5-62 C141-E218
Word Value Content
8-254 X'0000' Reserved
255 X'xxA5' Integrity word. Bits 15:8 contains the data structure checksum that is
the two's complement of the sum of all byte in words 0 through 254
and the byte consisting of bits 7:0 of word 255.
*: When "48 bit LBA" of the option (customize) is supported, same number of
LBA as WORD60-61 is displayed.