IBM 127MB / 230MB (MO) Optical Disk Drive

For FRU-P/N's, Double-Click >> IBM 127MB / 230MB (MO) Optical Disk Drive Parts
127-MB Drive OPT-P/N xxxxxxx (FAT)
127-MB Drive OPT-P/N xxxxxxx (SLIM)

230-MB Internal OPT-P/N ORI230M Drive
230-MB External OPT-P/N ORE230M Drive and Case

IBM 127MB Magneto-Optical (MO) Disk Drive.
If the Operating System is OS/2 and there are only FORMAT problems (read/write/copy is working), then

In all cases, you should first CLEAN the drive/media, before starting TESTs, or replacements.
see Optical Disk Drive Parts for the appropriate tool for the drive in use.

Next find the DRIVE-TYPE you are working with (FAT / SMALL or 230MB)

  1.  FAT
     On the FAT drive, on the upper left and right front side, you will find 3-sets of PIN's/jumper.
  2.  SMALL
     A sticker, describing all switch and jumper meaning, is on the Drive-bottom.
  3.  230MB

IBM 127MB Magneto-Optical (MO) Disk Drives.

FAT - Drive

Left side Jumperblock

Right side Jumperblock (SCSI Address)

SMALL - Drive

FUNCTION (DIP SWITCH ONLY SETUP) (DIP S1 Switch)

FUNCTION 1 2 3 4 5 6 7 8
DEFAULT Setup (Factory) 1 1 1 1 0 1 0 0
Create unit Attention 1 - - 1 - - - -
Disable Unit Attention 0 - - 1 - - - -
Check SCSI Parity - 1 - 1 - - - -
Ignore SCSI Parity - 0 - 1 - - - -
Device Type X'07' - - 1 1 - - - -
Device Type X'00' - - 0 1 - - - -
No Spin Up on POR - - - - 1 - - -
Auto Spin Up on POR - - - - 0 - - -
No Security Mode (normal) - - - - - 1 - -
C2 Security Mode - - - - - 0 - -
Without Power Saving Mode - - - - - - 1 -
With Power Saving Mode - - - - - - 0 -
Reserved (MUST be OFF) - - - - - - - 0
Mode Page 1,2,3,4 Support
(With Device TYPE X'00')
1 1 0 0 - - - -

FUNCTION (DIP SWITCH ONLY SETUP) (DIP S2 SWITCH - SCSI Address)

FUNCTION 1 2 3 4
SCSI Addr. 0 0 0 0 -
SCSI Addr. 1 1 0 0 -
SCSI Addr. 2 0 1 0 -
SCSI Addr. 3 1 1 0 -
SCSI Addr. 4 0 0 1 -
SCSI Addr. 5 1 0 1 -
SCSI Addr. 6 0 1 1 -
SCSI Addr. 7 1 1 1 -
Disable SCSI Terminator - - - 1
Enable SCSI Terminator - - - 0

FUNCTION (DIP SWITCH and CONNECTOR SETUP)


0 = DIP SW-Off
1 = DIP SW-ON
P = CONNECTOR Open
S = CONNECTOR Short to Ground (CON C1-1)
H = HIGH (Output)
L = LOW (Output)

FUNCTION CON C1 DIP S1 DIP S2 CON C2
Create Unit Attention - - - - - P 0 - 0 0 - - - - S - S -
Disable Unit Attention - - - - - P 0 - 0 0 - - - - P - S -
Device Type X'07' - - - - - P 0 - 0 0 - - - - - S S -
Device Type X'00' - - - - - P 0 - 0 0 - - - - - S S -
Mode Page 20 Support - - - - - S 1 1 1 - - - - - P P P -
SCSI ADDRESS 0 - P P P - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 1 - S P P - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 2 - P S P - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 3 - S S P - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 4 - P P S - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 5 - S P S - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 6 - P S S - - - - - - 0 0 0 - - - - -
SCSI ADDRESS 7 - S S S - - - - - - 0 0 0 - - - - -
Disable SCSI Terminator - - - - - - - - - - - - - 0 - - - S
Enable SCSI Terminator - - - - - - - - - - - - - 0 - - - P
Normal Mode (Output) - - - - H - - - - - - - - - - - - -
Power Saving Mode (Output) - - - - L - - - - - - - - - - - - -
Ground (Output) L - - - - - - - - - - - - - - - - -

127MB MO-Drive DOS OS/2 CONFIG.SYS examples

CONFIG.SYS example (FAT-drive used with DOS)
DEVICE=C:\IBMRWOPT.SYS /U

CONFIG.SYS example (SMALL-drive used with DOS)
DEVICE=C:\OPTIMO\OPTIMO.EXE

in an available OPTIMO.CFG file you will see
rem timeout 0
adapter IBM #=0
drive IBM3125 cid=2 lun=0

CONFIG.SYS example (FAT-drive used with OS/2)
DEVICE=C:\OS2\SCSI.SYS /N:4
DEVICE=C:\OS2\OPTICAL.SYS /N:4 /U

(some newer OPTICAL.SYS driver support /T:xx parameters (POWER-save option, after xx minutes.))
NOTE: (OPTICAL.SYS parameter)



CONFIG.SYS example (SMALL-drive used with OS/2 V-2.0 or higher)

If you are running OS/2 V-2.1 or below, you MUST replace the
existing FORMAT.COM file in the C:\OS2 directory, with the
FORMAT.COM shipped with the OPTION. (Optical Disk Driver For OS/2 diskette)
(rename the origin FORMAT.COM, do not delete !)

BASEDEV = IBM2SCSI.ADD /LED (only on PS/2 systems used)
BASEDEV = OS2SCSI.DMD
DEVICE=C:\OS2\MO.SYS /D1

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IBM 230MB Magneto-Optical (MO) Disk Drives. (Internal and External)

Product Description
The 230MB MO-drive meets the Small Computer System Interface-2 (SCSI-2) standards set by ANSI. This drive reads and writes both 128MB and 230MB optical media. The SCSI supports data transfer rates up to 5 megabytes / sec.

System Type Settings...
The following table indicates some possible combinations of the customization switch settings for several manufacturer computers.

  .... for 230MB INTERNAL Drives
       System Type       Position 1    Position 3
       ------------------------------------------
       IBM PC            ON            ON
       Apple Macintosh   OFF           ON
       Sun               OFF           OFF
       DEC               OFF           OFF
  .... for 230MB EXTERNAL Drives
       System Type       Position 3
       ----------------------------
       IBM PC            ON
       Apple Macintosh   ON
       Sun               OFF
       DEC               OFF




DIP SWITCH SCSI-ID / Termination SETUP (230MB - Internal Drive)

SCSI-ID INTERNAL - DRIVE
DIP-SW
4 3 2 1
Apple / Sun / DEC
EXTERNAL - DRIVE
Rotary Switch
IBM PC
EXTERNAL - DRIVE
Rotary Switch
SCSI Addr. 7 - 1 1 1 7 F
SCSI Addr. 6 - 1 1 0 6 E
SCSI Addr. 5 - 1 0 1 5 D
SCSI Addr. 4 - 1 0 0 4 C
SCSI Addr. 3 - 0 1 1 3 B
SCSI Addr. 2 - 0 1 0 2 A
SCSI Addr. 1 - 0 0 1 1 9
SCSI Addr. 0 - 0 0 0 0 8
Termination DISABLE 1 - - - No Terminator conn. No Terminator conn.
Termination ENABLE 0 - - - Terminator connected Terminator connected


Customization Switch Settings (230MB - Internal Drive)

If you are not familiar with the customization switch, use the default settings (marked with (* )
Write cache is used to improve performance of the Optical Drive by returning a write complete status when the data to be written has been loaded into the buffer memory of the Optical Drive. There is a small risk of the data being lost due to a power loss or drive failure with write caching enabled. The user should choose either performance improvement (write cache enabled) or fail-save data integrity (write cache disabled)
Position 4 defines how the Optical Drive configures itself after it is turned on or using a SCSI Reset situation. This setting may be over-ridden by the write caching option chosen in the device driver. See the README.TXT files that come on the device driver diskettes for OS/2 and DOS for details.

SW-Pos Setting Description (INTERNAL drive)
1 ON (* Enable unit attention on POR/SCSI reset
1 OFF With Position 3 ON:
Disable Unit Attention on POR/SCSI reset (for Apple attachment)
With Position 3 OFF:
Mode Page 1,2,3,4 support (for DEC/SUN attachment)
2 ON (* Check SCSI parity
2 OFF Ignore SCSI parity
3 ON (* Device type inquiry data is hex 07 (optical disk drive)
3 OFF Device type inquiry data is hex 00 (hard disk drive)
4 ON (* Write cache disabled after POR/SCSI reset
4 OFF Write cache enabled after POR/SCSI reset
(NOTE: with pos 1,2,3,4 set to ON,ON,OFF and OFF
respectively, write cache is disabled after Reset.)
5 ON No spin-up on POR
5 OFF (* Spin-up automatically on POR
6 ON (* Normal Mode
6 OFF C2 Security Mode
7 ON Default value of time interval hex FF (Do not enter power-down mode.)
7 OFF (* Default value of time interval hex 05 (Enter power-down mode after 5 minutes.)
8 OFF (* Reserved (must remain OFF)


Customization Switch Settings (230MB - External Drive)

SW-Pos Setting Description (EXTERNAL drive)
1 OFF (* Must remain in the OFF position for the External Drive to function properly
2 ON (* Check SCSI parity
2 OFF Ignore SCSI parity
3 ON (* Device type in inquiry data is hex 07 (optical disk drive)
3 OFF Device type in inquiry data is hex 00 (hard disk drive)
4 ON (* Write cache disabled after POR/SCSI reset
4 OFF Write cache enabled after POR/SCSI reset
(NOTE: with pos 1,2,3,4 set to ON,ON,OFF and OFF
respectively, write cache is disabled after Reset.)
5 ON No spin-up on POR
5 OFF (* Spin-up automatically on POR
6 ON (* Normal Mode
6 OFF C2 Security Mode
7 ON Default value of time interval hex FF (Do not enter power-down mode.)
7 OFF (* Default value of time interval hex 05 (Enter power-down mode after 5 minutes.)
8 OFF (* Reserved (must remain OFF)


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