Chapter 5  Troubleshooting
A501: SDLT Hard Write Error
204 SuperLoader User’s Guide
Table 31   Hard Read 
Error/Hard Write Error 
Field Descriptions
14
 Tape Number
15
       Retry Count
Logical Blk Num 
(LBN)
16
Head Wear Hours BRC Head Wear Hours
Field Description
Media ID Random number used to identify tapes
Physical Block 
Number (PBN)
Physical block location where the error occurred. There is one 
physical block for each read/write head on each track. For example, 
if there are 4 separate heads and 10 tracks, there would be 40 physical 
blocks on a single point of that media. 
Tape Address  Location on tape in inches
Track Number  Track number where error occurred
Retry Count  Retry count used when reading
Logical Block Number 
(LBN)
A block of data on media that includes all physical block associated 
with all heads for that single point of media. For example, in the 
forward direction if there are 4 heads and 10 tracks 5 forward and 
5 backwards, there would be two logical blocks going backwards. 
Yet these two logical blocks would equate to 10 physical blocks.
Head Wear Hours Number of Head Wear Hours for the SDLT Head reported by Servo
BBC Head Wear Hours  Number of Head Wear Hours for the BRC Head reported by Servo