Mine is a desktop running Vista Ultimate. I have a 500gb and a 40gb hard drive. They are both sata drives and plugged into two sata sockets on an Intel MB.
I presently have two partitions on each and there are boot sectors on each one.
I can presently boot from either of the two as the bios seems to give me a choice on start up.
I want to use one drive for everday operation and the other for storage.
The bios on this machine seems to recognize each PARTITION with an active boot sector.
I don't clearly understand the best arrangement for this and am hoping someone can CLARIFY it for me.
Any thoughts and suggestions will be greatly appreciated.
Ivan CopasSounds like you have it set up fine.

You can MANUALLY save your data on the second drive, or you can use Explorer to move My Documents to the storage drive.

Or you can move My Documents to the second partition on the first drive and use the second copy to KEEP a backup copy of My Documents.You stated how it's setup quite clearly.
But i'm not quite sure what your goal is and/or what you want to change here...Thanks so much for your response.
I'm not too clear as to what I want to do.
I'm without experience as to how this set up should behave and sometimes it seems cumbersome.
I have two partitions on each drive and sometimes I lose track of which partition I am looking at.
I can't always send a file to the partition I would like. I know this is all my fault, but:
I have found if one is not clear on what they want the computer to do; it sort of has a mind of it's own and sometimes gives unexpected results.
I have in the past, lost some files due to hardware/software failure. (Or mine)
I think I want to use the second disk as a temporary back up.
I am using a disk partition program that I downloaded from the net. It sometimes leaves me flying blind.
Thanks again for your time.
Ivan Copas I have 2 PC's setup this way so i'll try and explain what i've done to keep track.

When you use the BIOS to select which OS to boot to and each is installed seperately on seperate drives here's what happens:
Whatever OS you boot to the 1st partition of that drive becomes C; no matter what...
CONSEQUENTLY the 1st partition of the drive you did Not boot to becomes D:

So lets say XP is on drive 1 and Vista is on drive 2...the following will happen
Boot to XP the XP drive is C: the 1st partition on the Vista drive is D:
Boot to Vista the Vista drive is C: the 1st partition on the XP drive is now D:
====================================

Now that that's clear as mud...
To help keep additional partitions sorted i use a main volume label for each drive and name the other partitions accordingly.

For example each drive in the above scenario has an OS installed and 3 partitions on each drive.
So the XP drive being drive 1 is Alpha
partition2 on that drive is Apha2...and so on.

The 2nd Drive volume label is Beta...
partition2 is Beta2 and so on.

This way no matter how the drive letters move around i still am aware of what and where each partition is.That's really smart, Patio. I am just starting to go that direction with my first multi-drive, multi-boot system.

So far I've not been confused just because I am generally aware of how big my partitions are and what the contents are, but I really like your idea.Not really smart...just logical really.
Came out of neccessity back when i only had 1 running benchtest machine with 3 HDD's and 6 OS's installed....

It was self-preservation at that point...I can see that! Wow! 3 HDD and 6 OS!