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Merge 2 hard drives c and d

Sony Vaio has 2 x 80g drives c and d.
System keeps saying C drive is nearly full make some space.
How can I make c and d drives one? Running Win XP Pro
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I'll check later on the info you asked for but blimey the RAID option sounds complicated! I'm wondering why Sony don't just build the system with one drive?!
Use c: for the OS, and d: for the data. Lose one and the other remains.

Hard drives do not merge well, (this is not Netware, right?). Most things on c: can go to d: well enough. Just don't install so much on only the default drive.

You must know that eventually you are going to run out of space. Defer that by deleting the unnecessary.

To clean it up, delete any temporary files, delete any temporary folders, log files, old emails, redundant files from upgrades, and uninstall things not necessary, such as games that are no longer played. You can put your swap file on d: as well. Move your bigger downloads to d: if you want them handy, and try it for other temporary files as well, all downloads, data, email, save games, documents, etc.

80 is more than enough for c:.

If you want more on c: the solution is to buy a larger one. Or, be more conservative in what you are using that space for.

I agree that RAID is no answer, and compression schems are not worth that mush either, although if applied on a secondary partitioned drive can work out if done right.
Use Partition Magic to either (a) decrease the size of "D" and the associated extended partition and then increase the size of "C" --or-- merge "C" and "D" together.

I prefer having two partitions for backup purposes.  You don't have to give "C" all the space of "D", just the amount you want transferred.  SAFE - EASY - FAST.
About my comment above:  this will only work if you only have a single physical drive installed - I think SONY does!
> this will only work if you only have a single physical drive installed - I think SONY does!

I agree. Although PMQ can lead to problems as well, not to mention time and cost, most mfr's deliver only one drive, and Sony is no exeception, if it is in original condition.

As mfr's go, Sony is also one that preloads the OS for you - as well as numerous 'free' or shareable programs, utilities, games. Initially these look like fun options, but they all take up a lot of space. Do you really need all those preloaded CDs for several ISPs? There's a lot of junk in the original equipment (called OEM) that take up a lot of space and you really do not need. Very good candidates for removal. None of them are current anymore anyway, all would need to be replaced with newer version (among the reasons they were added for you so cheaply). These can easily amount to over ten times the size of Microsoft Office, and we all know how full of bloat that is, but at least it is fairly functional, especially compared to the freebies loaded on c: before you buy.
partition magic can lead to issues and it also costs money.  using windows xp pro there is a free way to do this but there ofcourse is always some risk.

from mmc help about dynamic disks: Dynamic disks provide features that basic disks do not, such as the ability to create multidisk volumes.....etc
first things first to do this I would advise being in safe mode so there isnt anything unexpected accessing your hard drive while the converstion is going. also back up any important data to cdr or dvdr whichever.
to access this you would goto: Control Panel > Administrative Tools > Computer Management
  From there goto: Storage > Disk Management
   Then right click on "Disk 0" in the bottom right frame and click "Convert to Dynamic Disk" -- When it pops up a dialog saying "Convert to Dynamic Disk - Select one or more drives to convert to dynamic disk" make sure to check "Disk 1" and that "Disk 0" is already checked.  follow the wizard through converting drives to dynamic drives. It will give you a few warnings saying that u will only be able to run windows from converted partitions blah blah blah... Then it will say it needs to reboot.  Once you reboot back into windows your drives should now be dyanamic.  The word "Dynamic should appear under the "Disk 0" & "Disk 1" labels in that same lower right window.  Once this is complete if it did not merge the drives which I dont think it will on its own you need to right click over the "C:" in the top right frame and click "Extend Volume".

This is as far as I come and ive only did it twice.  Please note that you may not be able to extend the "system drive" as ive never tried it... only secondary drives.

gl - maxinfo
Sony typically does build systems with one drive, though I haven't seen them partition a drive exactly in half the way your is.  (Not that Sony is precluded in any way from doing something like that.)   I tried to make the RAID option sound intimidating just in case you had purchased a sony with one hard drive, then added a second drive yourself, and now wanted to change the configuration.
Done. Answer is?
Answer:

It is only one hard drive, so I used partition magic to merge the partitions.