Re: Calculating a Kilobyte

hi,

thanks for that explanation.
i didn't do the calculations, i just expect the internal number reported to be about 10gig less than what is on the label when it's the same, just stated in a different measurement. 
Bryan Schulz
The BEST Solution
www.best-acts.com
----- Original Message ----- From: "black ares" <matematicianu2003@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Wednesday, October 29, 2008 1:20 AM
Subject: Re: Calculating a Kilobyte



again doing computations
we have
250000000000/1024=244140625
244140625/1024=238418,5791015625
238418,5791015625/1024=232,83064365386962890625
Acording to our suposition your hdd must have around 233 g b, it seems that this manufacturer has been very kind because your hdd seems to have 
255550554112 bytes which are more than 250000000000
according to their marketing they could advertise your hdd as 255 gb.
----- Original Message ----- From: "Bryan Schulz" <b.schulz@xxxxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Wednesday, October 29, 2008 7:26 AM
Subject: Re: Calculating a Kilobyte



hi,

who is ever that naive?
after formatting, etc. the drive will always have less than the advertised capacity. i just got a spare wd 250laptop drive and slid it into an enclosure to velcro to the lid of the laptop for extra storage. with no data, right after creating a partition, there was only 238.something gb so right there, i lost about 12 gig. 

Bryan Schulz
The BEST Solution
www.best-acts.com
----- Original Message ----- From: "black ares" <matematicianu2003@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, October 28, 2008 4:54 PM
Subject: Re: Calculating a Kilobyte



no,
if you make the computatins you wil se:
79999631360/1024=78124640
78124640/024=76293,59375
76293,59375/1024=74,505462646484375
So how I said your avertised 80gb has in fact 74 gb.
----- Original Message ----- From: "Octavian Rasnita" <orasnita@xxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, October 28, 2008 11:26 PM
Subject: Re: Calculating a Kilobyte
What you and Sina said is pretty wrong. I have a hard disk of 79999631360 bytes. 
It doesn't begin with "8", but it was advertised as an 80 GB hard disk.
If it would be like you and Sina said, it should have some more with around 300 KB.
And if would be like you and Sina said, all the hard disks that advertise that have 80 GB, should have exactly the same number of bytes (if they don't have bad sectors which might not be counted), but it is not the case.
Each manufacturer makes his hard disk as good as he can, and nobody cares about a few hundread kilobytes or actually tens of megabytes. And this is because they are too powerful. It wouldn't be ok if they would say that a kilobyte has 1000 bytes, because it is not true.
If it would be ok, you could found that you bought an ounce of gold which is evaluated to 10 grams instead of more than 28, just because that was the evaluation of the seller. 

Octavian
----- Original Message ----- From: "black ares" <matematicianu2003@xxxxxxxxxxx> 
To: <programmingblind@xxxxxxxxxxxxx>
Sent: Tuesday, October 28, 2008 10:20 PM
Subject: Re: Calculating a Kilobyte



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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