OpenEuphoria

Re: [WIN] drive space used != total file space used; whynot?

• Posted by Dan Moyer <DANIELMOYER at prodigy.net> Feb 10, 2002
• 486 views

Mr. Trick,

Nope, I've been taking cluster size into account, in a non-optimal fashion,
as I haven't yet been able to get an accurate programmatically determined
cluster size for larger drives. For *my* drives I just put the cluster size
for each drive into the program; for general use I'll have to let the user
use properties to discern cluster size and select proper size and have that
go into a ini file, unless I can find some better way.

And I *think* I can't use
usedSpace = diskSize - freeSpace()
because I think freeSpace() doesn't work on a drive larger than 2 or 3 gigs,
as it's dependent on cluster size, and cluster size is not correctly
returned for larger drives.

I may have to ignore the total drive size discrepancy, since it was
directory sizes I am more concerned with, and they're accurately done.

Thanks though,
Dan


----- Original Message -----
From: <mistertrik at hotmail.com>
To: "EUforum" <EUforum at topica.com>
Sent: Sunday, February 10, 2002 12:30 PM
Subject: Re: [WIN] drive space used != total file space used; whynot?


>
> >I'm getting that ok (verified afterward by using "properties" on each
> >directory & comparing), but when I SUM UP all the space used by all
> >directories (& also all files on the drive which are not in
>directories),
> >and compare that to what I see when I use "properties" >on the DRIVE
> >itself, the "properties" says there's more space used up >on the drive
than
> >the summing of the directories says.
> >
> >So I'm wondering what I'm missing.
> >Anybody got any idea what might be going on?
> >Dan
>
> Cluster size?
>
> A 352 byte file will occupy 1 cluster on the disk, even though is smaller
> than that. The discrepancy you are seeing may be because of this. Each
file
> needs to occupy a whole number of clusters, so if it uses part of a
cluster,
> it 'spills over' and is seen to occupy all of it. (or something like that)
> Alternatively, use:
>
> usedSpace = diskSize - freeSpace()
>
>
> =====================================================
> .______<-------------------\__
> / _____<--------------------__|===
> ||_    <-------------------/
> \__| Mr Trick
>
>
>
>