1.7 RELIABILITY SPECIFICATIONS
MTBF:
PM:
MTTR:
Service life:
1.7.1 READ ERROR RATES
Recoverable Read Errors:
Nonrecoverable Read Errors:
Seek Errors:
1.7.1.1
BIT
JITTER
20,000 Power-on hours
(Sea level, 25°C ambient temp.)
Not required
30
minutes
5 years
1 per
10
10
bits read
1 per
10
12
bits read
1 per
10
6
seeks
Bit
jitter
reduction determines the relationship between the leading
edge of
read
data and the center of the data window.
The specified read
error
rates are based on the following bit
jitter
specifications: the data separator must provide at least
-40
dB of bit
jitter
reduction
at
2F
with
an
offset
error
of less than
1.5
nsec. shift
from the
center
of
the data window.
1.7.2
MEDIA
DEFECTS
A media defect is a read
error
when the data, which has been correctly
written, cannot
be
recovered within
16
retries.
A printout
will
be
provided with each
drive
shipped listing the locations
of any defect by head, cylinder, sector and byte.
It will also specify
the
number
of bytes from index. For MFM this
will
be
based on 1.6
psec.lbyte. RLL encodi
ng
is based on 1.056 psec.lbyte.
A single
media
defect may
be
up
to
16
bits long. Cylinders
0,1,2
and
3
will
be
free
of defects.
1-4
ST2511251
RI277R
Product
Manual, Rev.A
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