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"CS" or "Master and Slave"?



 
 
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  #1  
Old November 25th 04, 03:44 PM
John
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Default "CS" or "Master and Slave"?

My eMachine 1860, running WXP, has been flakey on boot for a year now; once
it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS". The
shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.


  #2  
Old November 25th 04, 04:40 PM
Jan Alter
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Default

If it's working leave it alone and be happy. Manufacturers of hdds allow
various configurations to allow the hdd to work by what other hardware one
already has hooked up on the system. Actually you could hook the hdd as a
slave, as long as it's jumpered properly, and make a CD-ROM a master.
To expand, many times I've added a CD-ROM writer to a system that insists
it must be a master. Sometimes it would not be seen on the OS unless I tied
it in as a slave. The drive would work fine when done that way.
And sometimes getting a system to run is akin to Han Solo pounding his
fist against the side of the consol of the Milenium Falcon to go to
Hyperdrive.

--
Jan Alter

or

"John" wrote in message
...
My eMachine 1860, running WXP, has been flakey on boot for a year now;
once it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS". The
shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.



  #3  
Old November 25th 04, 06:52 PM
MCheu
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Default

On Thu, 25 Nov 2004 14:44:13 GMT, "John" wrote:

My eMachine 1860, running WXP, has been flakey on boot for a year now; once
it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS". The
shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.


You've basically got two choices with IDE drives on a given channel:

1. One drive as master, and the other as slave. As a matter of
convention, the master is placed at the end of the cable and the slave
in the middle, but this really doesn't matter.

2. Cable Select (CS). You're still using the master/slave system, but
it's determined by the position on the cable. Both drives have to be
set to CS. The master is whatever drive is at the end of the cable,
the slave is whatever drive is in the middle. If you've got one drive
as CS and the other set to either master or slave, it *might* work if
the jumpers are correctly set for the position -- but it sometimes
won't.

The CS system is often employed by big OEMs because they can just have
the jumpers on all of their drives to CS. That way, they don't have
to worry about the jumper settings on the drives, they just grab a
drive off the stack, plug it into the current machine, and move onto
the next one. It's faster for assembly line building.

Smaller OEMs and hobbyists prefer to use the Master/Slave settings
because drives usually ship as being set to Master, and this way
there's no ambiguity when you need to trouble shoot the system. You
know exactly which drive has taken what position.

Either way works, so long as you remember not to mix and match the
settings, eg. CS on one and Master or slave on the other. It might
work, assuming it's on the right position, and the controller hardware
lets you get away with this, but it's not guaranteed that this will
work.
---------------------------------------------

MCheu
  #4  
Old November 25th 04, 09:04 PM
Grinder
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Default

MCheu wrote:
On Thu, 25 Nov 2004 14:44:13 GMT, "John" wrote:


My eMachine 1860, running WXP, has been flakey on boot for a year now; once
it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS". The
shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.



You've basically got two choices with IDE drives on a given channel:

1. One drive as master, and the other as slave. As a matter of
convention, the master is placed at the end of the cable and the slave
in the middle, but this really doesn't matter.

2. Cable Select (CS). You're still using the master/slave system, but
it's determined by the position on the cable. Both drives have to be
set to CS. The master is whatever drive is at the end of the cable,
the slave is whatever drive is in the middle. If you've got one drive
as CS and the other set to either master or slave, it *might* work if
the jumpers are correctly set for the position -- but it sometimes
won't.

The CS system is often employed by big OEMs because they can just have
the jumpers on all of their drives to CS. That way, they don't have
to worry about the jumper settings on the drives, they just grab a
drive off the stack, plug it into the current machine, and move onto
the next one. It's faster for assembly line building.

Smaller OEMs and hobbyists prefer to use the Master/Slave settings
because drives usually ship as being set to Master, and this way
there's no ambiguity when you need to trouble shoot the system. You
know exactly which drive has taken what position.

Either way works, so long as you remember not to mix and match the
settings, eg. CS on one and Master or slave on the other. It might
work, assuming it's on the right position, and the controller hardware
lets you get away with this, but it's not guaranteed that this will
work.


I just wanted to add a bit to this excellent description:

A "selecting cable" is typically stamped with "Master" (and possibly
"Slave") next to the corresponding plug.
  #5  
Old November 25th 04, 09:57 PM
DevilsPGD
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Default

In message MCheu
wrote:

Smaller OEMs and hobbyists prefer to use the Master/Slave settings
because drives usually ship as being set to Master, and this way
there's no ambiguity when you need to trouble shoot the system. You
know exactly which drive has taken what position.


Almost all of the drives I've bought recently have defaulted to CS
instead of master, especially drives that require 80wire cables.


--
No user-serviceable parts
  #6  
Old November 25th 04, 10:12 PM
Buccaneer
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Posts: n/a
Default


"Grinder" wrote in message
news:%Uqpd.85080$V41.10633@attbi_s52...
MCheu wrote:
On Thu, 25 Nov 2004 14:44:13 GMT, "John" wrote:


My eMachine 1860, running WXP, has been flakey on boot for a year now;
once it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS".
The shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.



You've basically got two choices with IDE drives on a given channel:

1. One drive as master, and the other as slave. As a matter of
convention, the master is placed at the end of the cable and the slave
in the middle, but this really doesn't matter. 2. Cable Select (CS).
You're still using the master/slave system, but
it's determined by the position on the cable. Both drives have to be
set to CS. The master is whatever drive is at the end of the cable,
the slave is whatever drive is in the middle. If you've got one drive
as CS and the other set to either master or slave, it *might* work if
the jumpers are correctly set for the position -- but it sometimes
won't. The CS system is often employed by big OEMs because they can just
have
the jumpers on all of their drives to CS. That way, they don't have
to worry about the jumper settings on the drives, they just grab a
drive off the stack, plug it into the current machine, and move onto
the next one. It's faster for assembly line building.

Smaller OEMs and hobbyists prefer to use the Master/Slave settings
because drives usually ship as being set to Master, and this way
there's no ambiguity when you need to trouble shoot the system. You
know exactly which drive has taken what position. Either way works, so
long as you remember not to mix and match the
settings, eg. CS on one and Master or slave on the other. It might
work, assuming it's on the right position, and the controller hardware
lets you get away with this, but it's not guaranteed that this will
work.


I just wanted to add a bit to this excellent description:

A "selecting cable" is typically stamped with "Master" (and possibly
"Slave") next to the corresponding plug.


I seem to remember that CS (Cable Select) was introduced in the days of the
original IBM PC by IBM and was originally for floppy drives.. It had a
twist of a number of strands in the cable between the two drive connectors.
This meant that when assembling PCs with more than one drive they did not
have to fiddle around setting jumpers for Master and Slave, the cable did it
for them.


  #7  
Old November 26th 04, 12:00 AM
VWWall
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Posts: n/a
Default

Buccaneer wrote:
"Grinder" wrote in message
news:%Uqpd.85080$V41.10633@attbi_s52...

MCheu wrote:

On Thu, 25 Nov 2004 14:44:13 GMT, "John" wrote:



My eMachine 1860, running WXP, has been flakey on boot for a year now;
once it is on it is fine, but it hands on boot about 20% of the time.
Monday it simply wouldn't come up, hanging on "IOM.SYS" everytime.

I took it in to the shop. They found a cable was nicked and the jumpers
were wrong. They set them to Master and Slave. Now all is well.
However, I checked the manual and it says to set the jumpers to "CS".
The shop says the manual is wrong.
Does it matter as long as the machine is working? Presumably the nicked
cable was the problem the whole time.
Thanks.


You've basically got two choices with IDE drives on a given channel:

1. One drive as master, and the other as slave. As a matter of
convention, the master is placed at the end of the cable and the slave
in the middle, but this really doesn't matter. 2. Cable Select (CS).
You're still using the master/slave system, but
it's determined by the position on the cable. Both drives have to be
set to CS. The master is whatever drive is at the end of the cable,
the slave is whatever drive is in the middle. If you've got one drive
as CS and the other set to either master or slave, it *might* work if
the jumpers are correctly set for the position -- but it sometimes
won't. The CS system is often employed by big OEMs because they can just
have
the jumpers on all of their drives to CS. That way, they don't have
to worry about the jumper settings on the drives, they just grab a
drive off the stack, plug it into the current machine, and move onto
the next one. It's faster for assembly line building.

Smaller OEMs and hobbyists prefer to use the Master/Slave settings
because drives usually ship as being set to Master, and this way
there's no ambiguity when you need to trouble shoot the system. You
know exactly which drive has taken what position. Either way works, so
long as you remember not to mix and match the
settings, eg. CS on one and Master or slave on the other. It might
work, assuming it's on the right position, and the controller hardware
lets you get away with this, but it's not guaranteed that this will
work.


I just wanted to add a bit to this excellent description:

A "selecting cable" is typically stamped with "Master" (and possibly
"Slave") next to the corresponding plug.


The middle plug is slave and is usually grey, with the end plug master
and black. The motherboad connector is blue. Some early cables did not
follow the ATA specs. This probably tainted the use of cable select.


I seem to remember that CS (Cable Select) was introduced in the days of the
original IBM PC by IBM and was originally for floppy drives.. It had a
twist of a number of strands in the cable between the two drive connectors.
This meant that when assembling PCs with more than one drive they did not
have to fiddle around setting jumpers for Master and Slave, the cable did it
for them.

The early hard drives used FM or MFM data, and were driven from track to
track by
a stepper motor. The cable twist still survives in floppy cables,
although few computers now have more than one floppy drive. Cable
select on modern ATA drives is done by a ground on pin 34, which tells
the controller which is the master. Pin 34 on the slave, (middle,
gray), is not grounded as it is on the end, (black) connector. The cable
supplies the ground at the MB, (blue) connector, and the system will
complain if a 40 wire cable is used for a drive that needs an 80 wire
cable, since no ground will be seen by the MB controller.

Virg Wall
  #8  
Old November 26th 04, 12:27 AM
VWWall
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VWWall wrote:

The early hard drives used FM or MFM data, and were driven from track to
track by
a stepper motor. The cable twist still survives in floppy cables,
although few computers now have more than one floppy drive. Cable
select on modern ATA drives is done by a ground on pin 34, which tells
the controller which is the master. Pin 34 on the slave, (middle,
gray), is not grounded as it is on the end, (black) connector. The cable
supplies the ground at the MB, (blue) connector, and the system will
complain if a 40 wire cable is used for a drive that needs an 80 wire
cable, since no ground will be seen by the MB controller.


Oops! Change: pin34 to pin 28, (CSEL). Pin 34, (CBLID), *is* used to
determine if an 80 wire cable is needed by grounding pin 34 at the MB.

Virg Wall, in a hurry to get to the turkey!
  #9  
Old November 26th 04, 11:36 AM
John Smithe
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Default

Using cable select will require a cable that supports the 'cable select'
function. As mentioned previously a 'cable select' cable will be labled
master at the end and possibly slave in the middle.
  #10  
Old November 26th 04, 12:32 PM
John Smithe
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John Smithe wrote in
. 1:

Using cable select will require a cable that supports the 'cable select'
function. As mentioned previously a 'cable select' cable will be labled
master at the end and possibly slave in the middle.



'Cable select' cables also frequently have a hole in them. I believe that
the hole will be between the master connector and the slave connector. This
is how the 'open circuit' ,mentioned previsouly, is achieved.

 




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