Helping people with computers... one answer at a time.
It is possible, but the result has a hidden danger to consider. In this case, it's best to go with the supported option.
Hi, I have a Dell Optiplex GX620 running WinXP 32-bit OS. I have 3.3GHz of Processor and 3GB of RAM. And a 75GB HDD. Question: I am wondering if I add a second hard disk to my computer to have more space, is there a way to have my computer read both drives as one large drive? Example: My original hard disk is 75GB, if I add a 500GB hard disk drive, can I make it where my computer has one C: drive that is the size of both hard disk drives combined?
In this excerpt from Answercast #23, I look at the problems associated with merging two drives into one. There are some better options.
The short answer is yes. It's been a long time since I've done it, for reasons which I'll explain in a moment.
Basically, I believe, in Disk Manager. You can select both drives and then manipulate them somehow. At least, that's how it used to be.
I'm going to strongly advise against doing that.
The reason is very, very simple. When you have two drives making this one logical C drive, if either of those drives fail, then your entire C drive has failed. In other words, you have doubled your risk of failure and it's something that I strongly suggest that you not do.
If either of those drives has a problem (has a bad sector, decides to fail, whatnot), then you might think that you could replace just that drive. But, effectively what you've set up is a very weak form of RAID... and you can't.
When you end replacing that drive, you end up having to reinitialize the entire volume that you've created out of both drives. So, it's not something that I recommend at all. In fact, I strongly recommend you not do this.
There are two alternatives:
1) Live with the two drives, just live with them.
Put your operating system and so forth on C. Let that be 75 GB and then manipulate your programs so that you're dealing with data on D which is 500 GB. That is the traditional solution. It is the supported solution; it's the approach that most people end up taking to this kind of a problem.
The other approach... and this one I'm also a little bit reluctant to suggest, but I'll throw it out there, not because it's a bad solution but because my experience has found it to be slightly less than stable.
2) Go ahead and create your C and your D drives as separate drives. Then setup what's called a mount point.
The command I'm going to point you at is a command in Windows (at least in Windows 7... I think it's there in Windows XP as well) called: "Mountvol." It may go by a different name in XP; potentially, plain old "Mount."
What Mountvol allows you to do is to mount another drive into what appears to be a folder of your first drive.
For example, you could create a folder on your C drive called "D." If you change the directory into that folder, you find the contents of the D hard drive. In other words, you would see all of the D drive as if it were a sub-folder on your C drive. The syntax for the utility is not trivial. It requires or depends on the volumes being formatted with NTFS; that is the only available format that supports having these kind of mount points involved.
My concern is that, in the past, when I tried to use it, it seemed that mount points disappeared without warning. I never could come up with a rhyme nor reason to it. And as result, I basically modified what I was doing so that I no longer relied on mounted volumes.
It is one of the approaches to getting around the 26-drive limit that's in Windows. You can mount volumes that don't have drive letters. Then you have a volume that contains lots and lots of different disk drives that do not suck up additional drive letters.
Like I said, it's not necessarily simple, but if you are bent on going down
this direction, I believe it is a much more appropriate direction to head than
trying to take the two drives and make them appear as a single C
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