Win7 wrongly think external HD is almost full

December 3, 2010 at 01:27:58
Specs: Windows 7
my external hard disk is almost full but when i calculate the size of the individual back-ups and folders i should still have at least 400 gig left?

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#1
December 3, 2010 at 06:19:28
windows may be using it to store hib files and restore files etc, you can set to show hidden files and system files etc in folder properties, that might show you where your free space is been eaten up..

i hate computers!
but cant help myself....


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#2
December 3, 2010 at 13:01:09
If you have the external drive formatted using FAT 32 file system there can be quite a bit of what is called slack space on a large partition.

Slack space is simply this. The hard drive partitions are further divided into clusters. a cluster can only store one file regardless of the file size. So, a Word document that may be only 4kb will occupy an entire cluster. Below is the default cluster size for different partition sizes.

Cluster sizes

for FAT32 are as follows:
512MB to 8,191MB = 4KB
8,192MB to 16,383MB = 8KB
16,384MB to 32,767MB = 16KB
Larger than 32,768MB = 32KB

NTFS - All partitions on a PC = 4KB default


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#3
December 3, 2010 at 14:18:32
To add to what OtheHill has told you, if you have a large number of small files on a large (32GB+) drive using fat 32 you have a lot of wasted space.
Even files that are only a few bytes in size will use 32kb, hence the discrepency between what you calculate as the total used and the actual amount that is occupied.
So a 100 very small files may show as 120kb total but actually use 3200kb.

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#4
March 12, 2011 at 05:32:15
I have a similar problem, however my drive is formatted as NTFS. About a week ago I used the search function and a few items popped up from the drive and were accessable however when you opened the drive through my computer it does not have the folders in there.
Can anyone help with this?

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#5
March 12, 2011 at 06:33:59
Twitchysteve

You need to start your own thread. Post your full specs and describe your problem in detail.


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