Maintenance and Service Guide  4-21
Addendum 108431-001 (11-88) to 
Manual No. 108033-003
Head Select
The Head Select selection verifies that each head 
of the fixed disk drive can be accessed and is 
functional.
Error Detection and Correction
The Error Detection and Correction selection 
verifies that the error detection circuitry in the 
fixed disk drive can properly calculate the error 
correction code.
Run All the Above Tests
The Run All the Above Tests selection allows all 
of the previously described Fixed Disk Drive Test 
selections to run sequentially.
Read Verify
The Read Verify selection verifies that the system 
can read each track of the fixed disk drive. The 
program reads the entire disk and reports the 
number of unusable tracks, if any.
Format Menu
The Format Menu selection provides two format 
program options and two formatting features for 
special applications only. The Format Menu  
allows you to run the following tests selectively 
on each physical drive present.
CAUTION
The  fixed  disk  drive  format  selection  
destroys  all  data  on  the  fixed  disk  drive.  
Before Formatting, back up all data stored 
on the fixed disk drive.
The Format Menu selections available are:
□ Conditional Format
□ Unconditional Format
□ Surface Analysis 
□ Change Interleave
□ Display Current Interleave