Seagate ST3500071FC ユーザーズマニュアル

18

NL35 Series FC Product Manual, Rev. D

Recovereable errors are those detected and corrected by the drive, and do not require user intervention.

Recoverable Data errors will use correction, although ECC on-the-fly is not considered for purposes of recov-
ered error specifications.

Recovered Data error rate is determined using read bits transferred for recoverable errors occurring during a 
read, and using write bits transferred for recoverable errors occurring during a write.

Unrecoverable Data Errors (Sense Key = 03h) are specified at less than 1 sector in error per 10

14

 bits trans-

ferred. Unrecoverable Data Errors resulting from the same cause are treated are 1 error for that block.

A seek error is defined as a failure of the drive to position the heads to the addressed track. After detecting an 
initial seek error, the drive automatically performs an error recovery process. If the error recovery process fails, 
a seek positioning error (Error code = 15h or 02h) will be reported with a Hardware error (04h) in the Sense 
Key.   Recoverable seek errors are specified at Less than 10 errors in 10

8

 seeks.  Unrecoverable seek errors 

(Sense Key = 04h) are classified as drive failures.

An interface error is defined as a failure of the receiver on a port to recover the data as transmitted by the 
device port connected to the receiver. The error may be detected as a running disparity error, illegal code, loss 
of word sync, or CRC error. The total error rate for a loop of devices is the sum of the individual device error 
rates.

You can enhance the reliability of NL35 Series disc drives by ensuring that the drive receives adequate cooling. 
Section 6.0 provides temperature measurements and other information that may be used to enhance the ser-
vice life of the drive. Section 8.2 provides recommended air-flow information.