Treesize is note at this link and it applies to XP too:
I have an IBM Lenovo laptop computer with a single partition. The total hard disk space is 46 GB of which 20 GB was free which I re-confirmed yesterday seconds before transferring a 30 minute video from my camcorder that was 6 GB in size to the computer. After the video clip was transferred, it didnot play on the computer as it was corrupted for some reason. So I deleted the clip and also cleaned up the RECCLE BIN. Now when I look up free space on my computer, it shows only 6 GB free instead of 20 GB.
I even tried adding up the sizes of individual folders under C: drive and they come up to less than 26 GB which means the free space on my hard-drive should definitely be @ least 20GB. Where did the 14 GB suddenly disappear ?
I tried rebooting the system, ran disk cleanup utility, disk defrag but still the system shows only 6 GB free. Please advise me as to how to retrieve the 14 GB that suddenly disappeared for no reason.