in fact they have the calculation which sina exposed earlier.
For example taking an 80 gb hdd
if you multiply with 1000 you have 80000 megabytes
also you have 80000000 kilobytes
and in the end you have 80000000000 bytes
Now taking the way back, but we will divide with 1024
we will have:
80000000000/1024=78125000
78125000/1024=76293,9453125
76293,9453125/1024=74,50580596923828125
how we see a 80 gb hdd has in fact 74.5 gb.
This is marketing, but they must base their marketing on something and
they find such ways.
This is similar to sound systems power measuring
some of them say the real power (rms)
but others use a pmpo measure which is greather than the rms and if
you are novice with sound systems, you buy a system with the greater
number.
For pmpo for example the real (rms) power is about 5% of the pmpo
power specified.
For example if you find a system which says that its power is 1000
pmpo wats you must be sure that the real (rms) power is about 50 wats.
----- Original Message -----
From: "Octavian Rasnita" <orasnita@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, October 28, 2008 8:26 AM
Subject: Re: Calculating a Kilobyte
A file doesn't occupy a certain multiple of sectors, but a multiple of
clusters. A cluster can have 4kb or more (and maybe less), depending
on the options you use when you format your hard disk.
If you use a 32kb cluster as a base for formatting, the access to the
hard disk might be a little faster, but more space will remain
unoccupied, because if a file has only 1 kb, then 31 kb remains
unoccupied, or if a file has 40 kb, it will occupy a cluster and 8kb
from the next cluster, the rest of 24 kb will remain unused from the
second cluster (or block, or whatever).
But this is not important when talking about the size of the hard
disks. No matter how you calculate, I guess no hard disk has exactly
80 GB, or 160GB... these are just sizes advertised by the hard disk
manufacturers, in other way said... are only lies.
It could be a mess if we could buy hard disk of 76 GB, 77 GB, 79 GB,
81 GB... the manufacturers could promote harder such products.
Octavian
----- Original Message -----
From: "E.J. Zufelt" <everett@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Monday, October 27, 2008 11:33 PM
Subject: Re: Calculating a Kilobyte
Also,
On a harddrive there is used space, free space and wasted space.
Since
information is stored on a disk in sectors there are times that a
small
amount of information takes up a large amount of space.
For instance, a file that is 123 bytes in size may take up 4096 bytes
because two files cannot be stored in the same sector.
The rule is that a single file can be stored in many sectors, but two
files
cannot be stored in any one sector.
HTH,
Everett
----- Original Message -----
From: "Sina Bahram" <sbahram@xxxxxxxxx>
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Monday, October 27, 2008 5:17 PM
Subject: RE: Calculating a Kilobyte
You're being caught by the fact that harddrive manufacturers measure
a
megabyte as 1,000,000 bytes, and your 188 gigabytes is being given
to you
in
terms of a gigabyte being 1,024 megabytes which are 1,024 killabytes
which
are 1,024 bytes.
Take care,
Sina
-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Hayden's
Harness
Attachment
Sent: Monday, October 27, 2008 5:01 PM
To: programmingblind@xxxxxxxxxxxxx
Subject: Calculating a Kilobyte
I have an external USB Hard Drive. That says ihave 188GB free. The
kilobytes
are 202,016,489,472. Dividing this by 188GB, gives 1,074,555,795.
Huh? I
thought 1MB was 1,024,576.
Angus MacKinnon
Infoforce Services
http://www.infoforce-services.com
"Faith is the strength by which a shattered world shall emerge into
the light." - Helen Keller
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