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ASM 421 Technical Description
3.4.1
FORMAT
The FORMAT command erases the complete MDS. The directory, file allocation table (FAT) and system
area on the MDS will be re-created. Some counter contents in the system area will be retained. The cur-
rent counter contents can be interrogated by the MDS STATUS command.
Telegram to the file handler:
0
1
2/3
4
5
6/7
CC CI ADB DBN DBL
xx 00 0000
'I'
'I'
0001
01H =
62 bytes
81H =
42 bytes
02H =
62 bytes
03H =
128 bytes
83H =
112 bytes
04H =
2045 bytes
84H =
1778 bytes
05H =
8189 bytes
85H =
7154 bytes
06H = 32765 bytes
86H = 28658 bytes
MDS name; 8 ASCII characters (20H-7EH)
Acknowledgement:
0
1
2/3
4
5
6/7
CC Status ADB DBN DBL
00 xx 0000
'I'
00
0001
Important: A new MDS must be formatted before being used in the system.
6GT2 002-0DA00
ASM 421 / V.24
6GT2 002-0DB00
ASM 421 / RS422
6GT2 002-0DC00
ASM 421 / TTY
8/9
10
11/18
19
0001
0CH Volume
MDS type
Bit
7
6
0
0
without ECC
with
ECC
without ECC
without ECC
with
ECC
See table
without ECC
in Chapter 1
with
ECC
without ECC
with
ECC
without ECC
with
ECC
8/9
10
0001 00
20
21
OPTIONS
INIT mode
'K' =
Not initialized; only DIR and FAT will be
re-created on the MDS. The old user data
remains physically in memory.
'L' =
Initialized; the whole MDS will be written
with the data in 'INIT value'.
5
4
3
2 1
0
0
0
0 =
Always read DIR and FAT completely
when this MDS enters the field.
1 =
Check sum mechanism enabled; DIR
and FAT are only read if the checksum
in the interface module does not
correspond with the checksum in the
MDS.
0 =
Complete old directory will be erased
(normal)
1 =
The old directory in the MDS will be
re-created in the MDS. The existing user
data lengths of the files remain unchanged.
The user data area will be over-written by
the specified data.
The directory to be formatted can also be
loaded into the ASM immediately before
the start of the format command by use of
the 'L' command (this option is only
meaningful if the INIT mode parameter
(byte 21) is set to 'L').
0 =
Complete MDS will be erased
1 =
DIR + FAT are erased; the user data is
preserved
0 =
Normal
1 =
The counters for write cycles or ECC offsets are
always retained. The counters are also retained even
when the system area is faulty (e.g., ECC error).
– 23 –
6GT2 097-3AH00-0DA2
22
INIT value
The complete MDS will be erased
and written with this data if the
parameter 'INIT mode' has the value
'L'.
Subject to change without notice!
RD: 03/02
J31069-D0142-U001-A0-7618
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