Re: Hard Drive Capacity Confusion
- From: Tom Stiller <tomstiller@xxxxxxxxxxx>
- Date: Sun, 09 Apr 2006 14:32:40 -0400
In article <090420061144290354%mason@xxxxxxx>, rasberry <mason@xxxxxxx>
wrote:
I have a 15" iMac, Machine Model: PowerMac4,2 CPU Type: PowerPC
G4 (2.1) with what I thought was a 40 MB Hard Drive.
I am operating OS X 10.4.6. At one time I had a TechTool Pro eDrive
installed but have since removed it using their removal tool.
If I use Disk Utility or About this Mac, I am told that the Drive
Capacity is 38.0 GB Available Space is 11.5 GB and that 21.6 GB is
used. Available plus Used adds up to 33.1 GB NOT the stated capacity of
38.0 GB.
Doing a Get Info on the Hard drive reports tha capacity as 33 GB with
Available Space is 11.5 GB and that 21.6 GB is used.
Can anyone explain the discrepancy? How much space do I really have? If
I have really "lost" 5 GB of drive space, how do I get it back?
There are two issues here. One is the often discussed 1000 vs 1024
issue and the other is exactly what is meant by "used" space.
For an example of the first, open a terminal window and type the
commands:
df -k
df -m
df -g
The first will show the number of 1024 (1K ?) byte blocks,
the second will show the number 1024*1024 (1M ?) blocks, and
the third show the number of 1024*1024*1024 (1G ?) blocks.
For the second question, consider that the disk contains not only file
data, but also metadata about the drive itself (e.g. allocation vectors,
etc.) as well as filesystem structural data. If this data is tagged as
"assigned", then the sum of all file sizes will come up short. If this
data is tagged as "available", then the disk will seem to fill
prematurely.
Disk Utility reporst a single partition on the Maxtor 4D040H2 Hard
Drive of 38.03 GB.
--
Tom Stiller
PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3
7BDA 71ED 6496 99C0 C7CF
.
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- Hard Drive Capacity Confusion
- From: rasberry
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