E
RA7x Error Rates
This appendix defines the acceptable error rates for the RA7x disk drive. If
error rates are no more than those indicated in Table E–1, the RA7x drive is
performing within specifications.
Table E–1 RA7x Error Rate Table
Error Type
Temperature Range Between
16°— 39° C (60°—103° F)
Type I
1 in
7
data bits read
Type II
2 in
10
data bits read
Loss-of-position
1 in
6
seeks
Soft error
1 in 3.3 x
6
data bits read (1 in
6
seeks)
Hard error
2 in
13
data bits read
BBR rate
5 blocks per
12
data bits read
CAUTION
For maximum performance and reliability, always operate the RA7x
between 18°—24° C (65° – 75° F).
E.1 Type I Data Errors
A type I data error is any recoverable data error detected with an error correcting
code (ECC) of less than six symbols in error. These errors are not normally
reported by controllers or host operating systems. The controller simply corrects
these errors and continues.
E.2 Type II Data and Header Errors
A type II data error is any recoverable data error detected with an ECC of six
to eight symbols in error and is
not
replaced upon invocation of a bad block
replacement (BBR) algorithm.
A type II header error is any recoverable error detected as a failure of the header
compare algorithm (for example, corrupted header, header sync timeout, and so
forth) when applied to the correct (desired) header block. This type of error is a
recoverable header error that is
not
due to servo positioning problems.
RA7x Error Rates E–1
