Toshiba M200-ST2002 Maintenance Manual - Page 129

3.11 Hard Disk Test 3 Tests and Diagnostics The first digit of the STATUS number indicates the drive number being tested and the last two digits indicate the error status code as explained in Table 3-5. Subtest 01 Subtest 02 Sequential read This subtest is a sequential reading of all the tracks on the HDD starting at track 0 to maximum track. When all the tracks on the HDD have been read, the test starts at the maximum track and reads the tracks on the HDD sequentially back to track 0. Address uniqueness This subtest writes unique address data to each sector of the HDD track-by-track. The data written to each sector is then read and compared with the original data. There are three ways the HDD can be read: 1.Forward sequential 2.Reverse sequential 3.Random Subtest 03 Subtest 04 Random address/data This subtest writes random data in a random length to random addresses. This data is then read and compared to the original data. Cross talk & peak shift This subtest writes eight types of worst pattern data (listed below) to a cylinder, then reads the data while moving from cylinder to cylinder (to check the data interference in the neighbor track) to compare. After the third pass, it tests the motor-off function (HDD motor is turned off, stops for 20 minutes and is turned on). Worst pattern data 'B5ADAD' '4A5252' 'EB6DB 6' '149249' '63B63B' '9C49C4' '2DB6DB' Cylinder 0 cylinder 1 cylinder 2 cylinder 3 cylinder 4 cylinder 5 cylinder 6 cylinder Portege M200 Maintenance Manual (960-457) 3-29