dual drive

[Romeyn Prescott]

The IDE standard/architecture may not strictly require it, but I'm 
pretty sure that several models of Mac are pretty persnickety about 
this very thing.  When in doubt, hard-jumper the drives to 
Master/Slave and make sure the Master is at the end of the cable.

...ROMeyn


At 4:58 PM -0700 11/28/04, Corbett Battaile scribbled:
>I have to admit, I WAS pretty sure until I read your post and 
>decided to do some digging. It didn't take me long to find the 
>information I was looking for, e.g.:
>	<http://www.tomshardware.com/storage/20020806/>
>And, of course, you're right - according to the information I found, 
>the placement of IDE drives doesn't matter as long as they're 
>explicitly jumpered as Master and Slave. And all these years, I've 
>been living a lie! :)  (Albeit a safe and harmless lie.)
>
>On the other hand, it is apparently recommended that a lone (Master) 
>drive be placed at the end of the cable to avoid signal problems. 
>Maybe that's where I got the wrong impression. And some IDE cables 
>explicitly mark the two connectors as Master and Slave, but that's 
>probably for the very same reason.
>
>As the saying goes, you learn something new every day. Thanks for 
>the correction!
>
>
>--On 11/28/04 2:51 PM -0400 Jim Bauer wrote:
>>
>>  I have never heard of an IDE requirement that says that the master must
>>  always  (i.e. even when using explicit master/slave jumpers) be the unit
>>  furtherest  away from the motherboard.  No one else that I checked with,
>>  seems to have  heard that either.  I know you this this wasn't
>>  authoritative, but I still  have to ask.  Are you sure?
>>
>>  On Thursday 25 November 2004 11:28, Corbett Battaile wrote:
>>>
>>>  Let me start by saying that my answer is in no way authoritative, and
>>>  you might know all this already, so please forgive the self-indulgent
>>>  IDE tutorial if so. Plus, I don't have a copy of the YDL 3.0.1 guide,
>>>  and my 4.0 guide is at work. (Today's a holiday for most folks here in
>>>  the "good" "old" US of A.)
>>>
>>>  But I suspect that the confusion stems from how one defines "first" and
>>>  "second" on an IDE chain, and also whether one jumpers Masters and
>>>  Slaves explicitly or uses Cable Select to define the Master and Slave.
>>>  The important point, it appears, is that YDL should reside on the
>>>  Master drive.
>>>
>>>  So, that means that YDL should be installed on the drive FARTHEST from
>>>  the motherboard (the Master), and MacOS on the drive CLOSEST to the
>>>  motherboard (the Slave). Like this:
>>>
>>  [drawing snipped]
>>>
>>>  Now, regarding jumpers, there are two ways to do it. One, you could
>>>  jumper both drives with the Cable Select (CS) option. (Assuming your
>>>  drives support it - most newer ones do.) That sets the drive farthest
>>>  from the motherboard as the master, and the one closest as the slave.
>>>  Or, you could explicitly jumper the farthest drive as Master and the
>>>  closest as Slave. (Some drives have different jumper settings for
>>>  "Master with no Slave" and "Master with Slave present," so look out for
>>>  that.) Regardless, the Master always has to be at the end of the cable
>>>  (farthest from the motherboard) and the Slave at the middle of the
>>>  cable.
>
>
>--
>Corbett Battaile
>
>_______________________________________________
>yellowdog-general mailing list
>yellowdog-general at lists.terrasoftsolutions.com
>http://lists.terrasoftsolutions.com/mailman/listinfo/yellowdog-general
>HINT: to Google archives, try  '<keywords> site:terrasoftsolutions.com'

-- 
signat-url: http://www2.potsdam.edu/prescor/signat-url.htm