Toshiba T4400SXC Maintenance Manual page 58

Subtest 05 WritelRead/Compare (CE)
This subtest writes B5ADADh worst pattern data to the CE cylinder on the
HDD, then reads the data from the CE cylinder and compares it with the
original data.
Subtest 06 Write Specified Address
This subtest writes specified data to a specified cylinder and head on the HDD.
Subtest 07 Read Specified Address
This subtest reads data which has been written to a specified cylinder and head
on theHDD.
Subtest 08 ECC Circuit
This subtest checks the Error Check and Correction (ECC) circuit functions of
the specified cylinder and head on the HDD.
Subtest 09 Sequential Write
This subtest writes specified 2-byte data to all of the cylinders on the HDD.
Subtest 10 W-R-C Specified Address
3-28
This subtest writes data to a specified cylinder and head on the HDD, then
reads the data and compares it to the original data.