Section 1
General Description and Specifications
Media Quality
The ProDrive features defect management, which eliminates the need to manually identify defects. Defect
management
is
completely transparent to the user. See Appendix C for a detailed description
of
the
ProDrive defect handling procedure and ECC (Error Correcting Code) capability.
Error
Rates
Random Data Errors (2):
Defect Data Errors (3):
Unrecoverable Data Errors (4):
Seek Errors (5):
1 error per
10
10
bits read (maximum)
1 error per
10
12
bits read (maximum)
1 error per
10
14
bits read (maximum)
1 error per
10
6
seeks (maximum)
Error rates are defined by Quantum as follows:
1)
A data error
is
one (1) sector read incorrectly. Data error rates are defined as average rates measured
over at least
1000 different sectors under any
of
the specified operating conditions except applied
shock or vibration.
2)
Random errors are those which do not exhibit a repeating error pattern, i.e
.•
the error does not occur
twice in a row within a specified number
of
retry reads; the default is eight. (Retries are terminated
once data
is
read correctly.) The sectors will not be automatically reallocated since the errors are
probably not due to media defects.
See Appendix C for information on defect handling.
3)
Defect errors are those which exhibit a repeating error pattern, i.e
.•
the error occurs twice in a row
within eight retry reads. and cannot be read without error up to that point.
Such errors are likely due
to media defects. The sectors will be automatically reallocated
if
the Automatic Read Reallocation
Enabled bit in page 1 H and the Reallocate Uncorrectable Error Enabled bit in page 39H
of
the
MODE SELECT command are set to
1.
(The default is 0: automatic reallocation is not performed.)
See Appendix C for a description
of
error correction options.
4) Unrecoverable errors are those whose final retry error pattern is uncorrectable using ECC: retry reads
are terminated by either a repeating error pattern, or eight attempts without reading correctly.
5) A seek error is any seek
in
which the drive does not locate the desired cylinder.
or
any seek in which
the drive must go through a full recalibration routine to locate the desired cylinder. A full
recalibration takes approximately five seconds.
1.2.3
FUNCTIONAL SPECIFICATIONS
ProDrive 40S ProDrive 80S
Nom Rotational Speed (RPM)
3.662 ±O.3% 3.662
±O.3~
Max Recording Density (bpi}
22.055 22.055
Max Flux Density (fei)
14,700
14.700
Track Density (tpi) 1,000 1,000
Data Cylinders
834
834
Data Tracks
2,502
5,004
RlWHeads
3
6
Disks
2
3
Encoding Scheme
RLL 2,7 RLL 2,7
1·4
General Description and Specifications
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