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Interesting. I'll look into that.
Thanks.
Luc Pattyn [Forum Guidelines] [My Articles]
DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.
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Starting with Vista, the cmd shell has been enhanced to display alternate data streams. just do a dir with /R switch, and it will report names and sizes of ADS. Nota that downloaded files DO have and ADS called Zone.Identifier, but on my system (W7 RC), this alternate file is just 26 bytes. if you want to get at content without getting visual studio started, just do:
more filename:stream_name > whatever>.txt this will copy your stream to a file.
Note that your problem is most probably not ADS's, but Volume Shadow Copies (for system restore and uninstall), which are stored in the System Volume Information directory. Access is limited to the system account on this dir, so you can't see them. You could change permissions on the dir, but I would'nt recommend it (you can really screw your restore capabilities if you mess around with those files).
a better way to seem them is to use the vssadmin command:
vssadmin list shadows
or
vssadmin list shadowstorage
Michel Godfroid
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Hi,
there are lots of reasons why disk spaces always seem to be wrong somehow.
1. vendors like big numbers, they willingly substitute 1GB for 1000MB instead of 1024MB.
To make sure what the actual size is: compare the disk size advertized with the disk size shown in Computer Management/Disk Management.
2. the partition(s) do not necessarily fill the disk; see again Disk Management.
Many systems have a hidden boot partition, a (often hidden) restore partition, etc.
3. files use an integer number of sectors (=512B); however often sectors get allocated in clusters of 5 or more (FAT limits the number of sectors per partition to 65536, hence larger partition means larger sector, more space wasted).
4. folders need disk space too, AFAIK they are not accounted for disk space used in Explorer/Properties!
Luc Pattyn [Forum Guidelines] [My Articles]
DISCLAIMER: this message may have been modified by others; it may no longer reflect what I intended, and may contain bad advice; use at your own risk and with extreme care.
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Christopher Duncan wrote: Anyone have an idea as to where the other 30 gig is hiding?
If you have System Restore activated they can be there or you might have
an extra partition on the hard disk.
jhaga
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Only one partition, but I forgot to check system restore. I'll wager Vista enables it by default.
Worth looking into - thanks!
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My bet is the system restore directory after having downloaded the most recent patches. Windows is surprisingly effective at making the restore folder invisible unless you really go looking for it. And yet it still leaves the dozens of uninstall folders mucking up the windows folder...
The true man wants two things: danger and play. For that reason he wants woman, as the most dangerous plaything.
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So how do you find the system restore directory...
It is a truth universally acknowledged that a zombie in possession of brains must be in want of more brains.
-- Pride and Prejudice and Zombies
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Actually I stand corrected, I've been turning off system restore for so long I had to look where it was these days. Apparently they moved it into the 'System Volume Information' under _Restore. It used to take a non-windows kernel to make it show you the _Restore folder, now it's just a hidden compressed folder.
The true man wants two things: danger and play. For that reason he wants woman, as the most dangerous plaything.
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This is indeed the most likely answer
i had the same problem on my 100GB os partition
the System Information Volume folder was 15GB so 15% of your 150Gig is 22.5GB
Click <href="http: vistasupport.mvps.org="" decrease_storage_space-allocated_to_system_restore.htm"="">here to found out how to decrease it.
Basicly it's just the command: vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=2GB
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jhaga wrote: Christopher Duncan wrote:
Anyone have an idea as to where the other 30 gig is hiding?
In the past I've found that the Recycle Bin by default takes 10% of disk space and locks that away for itself. System Restore takes another 10% for its restore points.
Mathematically that (10%+10%)*150GB = 30GB! Ta-da! 
Neil
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i was actually wondering that myself, this week. i added up the sizes of all the folders, as reported by Explorer, and they didn't add up to the amount shown as used in C:\'s properties. and yeah, 30G sounds like the size of my discrepancy.
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So far system restore sounds like the most likely culprit.
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Yep. Deleted system restore points & turned it off, went from 82g free to 103.
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Is one reporting based on actual disk space used and there other reporting based on the byte size of the files?
A file might only be 1k bytes but take up a cluster size of 4k for example. So lots and lots of small files can eat up a considerable amount of disk space.
check properties on a file example:
Size: 911 bytes (911 bytes)
Size on disk: 4.00 KB (4,096 bytes)
Todd Smith
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Christopher Duncan wrote: with a 150 gig hard drive. I
They still make them that small ? :P
Christian Graus
Driven to the arms of OSX by Vista.
"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.
I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp
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Hey, it's a Dell. What can I say? 
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That's no excuse, I have 230GB on my Dell.
Have a nice day,
~Sidneys1
Always trying to help,
Sidneys1
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WinDirStat[^] will show you exactly where all your disk space has gone.
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May be it accounts for all the videos and movies from Bunny days hidden somewhere on the disk.
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Shhhhhhh! 
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Chris,
Come now, you already know the answer to that question: Vista has it. You're not allowed to know where, or why it has it, but it does. It's keeping it "safe". Using it for it's own purposes, that are far too complex for your feeble human brain to comprehend.
Stop asking so many questions, or the Vista might decide it doesn't need ... to keep you.
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Yikes.
Taxi! 
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Be careful. The emergent AI is using your PC to record store part of its memory. It would be just your luck it's using it to keep copies of its tax returns for 1983 to 1987, 1992, and 1996, as well as extra copies of the Topeka Kansas phone directory.
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I promise you, tax returns from my musician days in the 80s wouldn't use up 20 bytes.
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