4 years late but i just got vista and it does this too, but it goes bak up like it goes 17.2gb 17.0gb 16.7gb down to like 11gb then jumps to 19gb
I installed Windows 98 once, and it didn't work. Anyway, I was able to start up in Safe Mode, and I had something like 5.8 GB of space on that computer's hard drive.
I decided to re-install. I made a boot disk, and typed FDISK to re-partion my hard drive. I deleted by old partitions, and made a new one. When it asked if I wanted to use the maximum space for my partion, I hit yes. It said 508 MB. I figured something was wrong, so I restarted, and did the process of FDISK over. This time, instead of clicking yes to the maximum, I just set the value of space to be used on the partion I wanted (in percent) to 99%. It came out as like 500 MB.
What happened!? It's like my hard drive was randomly reduced to 1/10 the size! Any ideas? My first thought was that the hard drive was shot, but I later proceeded to install Windows 98 on it, so I fail to see how only 90% of it was ruined...
Any suggestions as to where to go would be helpful.
By the way, I'm 100% sure that my hard drive -was- very near 6 GB, so it's not just be seeing things or something.