May 2014
Intermediate to advanced
320 pages
13h 41m
English
Content preview from Servicing Personal Computers, 3rd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Tape
and
disk drives
169
One
byte
Data
address
|
mark
Data
CRC
(MSB)
CRC
(LSB)
Figure
4.27.
Data field organization
in the IBM
format
CRC
characters.
The
16-bit
CRC
character
is
generated using
the
polynomial
X
16
+ X
12
+ X
5
+ 1,
normally initialized
to FFH. Its
generation includes
all
characters
except
the CRC in the ID or
data
field.
Bad
track
format.
The
format
is the
same
as
that used
for
good tracks with
the
exception that
the
track
number,
side
number,
sector
number,
and
sector length
are all set to FFH.
0000
0010
0020
0030
0040
0050
0060
0070
0080
0090
OOAO
OOBO
OOCO
00 DO
OOEO
OOFO
0100
0110
0120
0130
0140
0150
0160
0170
0180
0190
01A ...