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I have 2 hard drives and when I do an auto install.. Ubuntu decides to take both hard drives... how do I prevent this from happening without my intervention?

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migrated from Feb 28 '11 at 1:34

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@sarnold, he's doing an automatic installation. The question explicitly says he wants to avoid manual "intervention." – Matthew Flaschen Feb 28 '11 at 1:30
@Matthew Flaschen, thanks, I completely overlooked the "without my intervention". Sorry. – sarnold Feb 28 '11 at 3:47

Manually Create/modify the partition that you are installing ubuntu on. Here is a tutorial that should help with the basics.

Modified answer

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The question clearly says he's doing an "auto install." – Matthew Flaschen Feb 28 '11 at 1:30
Yes I have manually done it - no problem... but let's say I want Ubuntu to do it on its own... Is there something I should be doing with my Hard drives to prevent this? Should my main hard drive be a master or 2nd be slave? I never checked it - but it works when I manually install. @dm03514 – Perry Feb 28 '11 at 1:31

I believe you need to use a preseeding file. The line should be something like:

d-i partman-auto/disk string /dev/sda

As the linked documentation warns, be very sure of which disk is /dev/sda (or whatever you choose).

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