Re: OT: Want a new hard drive...
 

He wasn't asking about multi-boot installation. He was asking about attaching two drives with two independently installed copies of the same OS to one computer. (XP 'Home' and 'Pro' are essentially the same OS.) I repeat, this is reputed to be dangerous. Directions for making backups by 'cloning' from one HD to another are very explicit not to try to boot the computer from the drives while drives with both copies are attached, but to only boot from the cloning utility (a CD, that is). Unless you have an elaborate boot manager like GRUB which can hide one of the copies from the other. Two different installations may not be exactly like a cloned backup and an original, but it sure isn't the same as a multi-boot installation where Windows has had a chance to sort itself out, either.

Re: OT: Want a new hard drive...
 

Bah, I had two 98 drives in my PC for a long time; if the master drive ever failed, the PC would automagically boot up using the slave, and the only difference would be the missing drive, and TC's SE4 desktop instead of a plain red background.

Considering the Canadian HDD curse, it was a sensible precaution.
Sort of a manual RAID thing.

Re: OT: Want a new hard drive...
 

But Win9x is not remotely the same as WinNT/XP.

Re: OT: Want a new hard drive...
 

But Windows XP is, and I have done what you're warning against without incident. If its mentioned during HD cloning, you probably have to have an actual clone for it to be a problem. Two non-identical installations are fine.

Re: OT: Want a new hard drive...
 

Which way he was asking (independent installs or installing to the 500 GB with the other drive still in place) isn't entirely clear (probably because he was implicitly asking how to do this). The safest bet is to plug just the 500 GB in, install XP Pro, then reconnect the old drive to copy files over. No need to worry about your MBRs in that case.

=0=

Two independently installed* copies of XP on different drives will not interfere with each other. Each drive will have a separate MBR, and only the MBR from the first drive will be used for booting. The NT boot loader does not try to detect other OSes at bootup; only the Windows installer application (and the fixboot/fixmbr apps on the recovery console) does this. The files on the second HDD are treated just like any other set of files; Windows won't randomly start thinking system files are on D/E/whatever. You won't be able to boot the second install up without changing your hardware configuration to set its drive as the primary master (or taking the other drive out so that it is the only drive). When you do, it will again not do anything to the files on the secondary drive. You do not need to "hide" one OS from the other if you connect two drives that each have an OS on them that was installed independently.

If you set the old hdd as a secondary drive, then instal XP on the new 500 GB drive, you get a multi-boot setup. AFAIK, there is no way to avoid that (without some interesting settings on a customized unattended install disk), as it is done automatically when the installer detects a pre-existing OS (assuming you don't choose to upgrade that OS in place). You can take the other OS out of the boot loader after the fact, naturally. I forget if Windows installer will use the old MBR and just add the new info to it, or if it will ignore it and create an entirely new MBR on the first primary partition of the primary master drive with info for booting both OSes. But either way, the OSes themselves will be intact, and you can simply restore a working MBR on the old HDD (after taking the new one out) with the recovery console on the XP cd to get the old install of XP working again.

* Meaning you put in one drive, install XP, take it out, put in the other drive and install XP on it.

SJ:
Win98 had a really primitive boot loader. It did not try to gather information about all installed OSes and manage them from a single MBR.

Re: OT: Want a new hard drive...
 

Just to clarify, from what I want to do and what people are telling me I should do -

- Take out my current drive (Call it Home HD). Insert the theoretical new 500GB drive (Call it Pro HD). Install XP Pro. Then, shut down, install Home HD as a secondary slave drive using jumpers (Does Pro HD need to be explicitly set to master drive?), start up, copy over all the files I want.

Sometime in the future, which I'm sure I've got everything, wipe Home HD.

Eat cheese.

(Thanks everyone!)

Re: OT: Want a new hard drive...
 

The default setting for jumpers is usually cable select. If you put the drive you want as master on the end of the IDE cable, and the other drive on the middle connection, you will usually get them detected as such.

http://h10025.www1.hp.com/ewfrf-JAVA.../c00180570.jpg

Or, you can futz around with explicit jumper settings, which is not very much fun.

Re: OT: Want a new hard drive...
 

Forgive me for my ignorance, but wouldn't it be easier to use a (or several) CD-RW('s) to manually copy the necessary files from the old hard drive and copy them onto the new hard drive?

Re: OT: Want a new hard drive...
 

Depends how much data there is to move. Moving the hard drive is often really easy and fast, and having 2 physical hard drives can be nice for performance, too (e.g. OS swap file on its own drive).

Re: OT: Want a new hard drive...
 

CD-RWs are horrendously slow, and do not help much if you forget about some files you want off of the old hdd. Much easier to just connect both (post installation of XP Pro on the new hdd).