Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




1300 posts

Uber Geek
+1 received by user: 165


Topic # 112202 30-Nov-2012 03:15
Send private message

So, you know how hard drives are advertised as being say, 500GB, but when you plug them into your computer they only show up as having 465GB, how is that not against the law, aren't things supposed to have exactly what they say they have and nothing less, like if i wanna buy a 500GB hard drive, i want to be able to use all 500 of those GB's

the same thing happens with my terabyte hard drive, it's not a terabyte its 931gb. a TB is 1024GB not 931.





View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
319 posts

Ultimate Geek
+1 received by user: 35


  Reply # 724979 30-Nov-2012 06:40
Send private message

Hard drive manufacturers quote the capacity of their drives by the decimal system, were kilo*=1,000 (and mega*=1,000 kilo* etc), whereas operating systems usually use the ‘binary standard’, where kilo*=1024 etc. On large modern hard drives this can amount to quite a difference.

Secondly, formatting discs involves creating a filesystem – a way of organising the files and folders on the disc (a bit like having table of contents, page numbers and indexes in a book), and this uses up some space. Depending on the filesystem, the amount of space can be considerable.

1332 posts

Uber Geek
+1 received by user: 152
Inactive user


  Reply # 724992 30-Nov-2012 07:44
Send private message

I suggest OP read the Wikipedia articles on binary prefixes & International System of Units.

 
 
 
 


25454 posts

Uber Geek
+1 received by user: 5268

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 724994 30-Nov-2012 07:49
Send private message

1080p: I suggest OP read the Wikipedia articles on binary prefixes & International System of Units.


+1





25454 posts

Uber Geek
+1 received by user: 5268

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 724996 30-Nov-2012 07:52
Send private message

hamish225:
the same thing happens with my terabyte hard drive, it's not a terabyte its 931gb. a TB is 1024GB not 931.


Incorrect.

A terabyte is 1000 gigabytes in using standard SI units or 931 gibibytes in binary.

HDD's storage is always measures in SI units. File systems typically use binary, but some *nix variants use SI.






BDFL - Memuneh
58928 posts

Uber Geek
+1 received by user: 10298

Administrator
Trusted
Geekzone
Subscriber

  Reply # 725000 30-Nov-2012 08:23
Send private message

sbiddle:
hamish225:
the same thing happens with my terabyte hard drive, it's not a terabyte its 931gb. a TB is 1024GB not 931.


Incorrect.

A terabyte is 1000 gigabytes in using standard SI units or 931 gibibytes in binary.


Nope. While 1000 Gigabtyes is 1 Terabyte in SI units, the binary is always going to be 1 TB = 1024 GB, 1 GB = 1024 MB, 1 MB = 1024 KB, 1 KB = 1024 Bytes, 1 Byte = 8 bits.

This of course doesn't invalidate the previous answers about metric system being used for HDD storage marketing and filesystem space utilisation.





3067 posts

Uber Geek
+1 received by user: 840

Trusted

  Reply # 725003 30-Nov-2012 08:44
Send private message

freitasm: 
Nope. While 1000 Gigabtyes is 1 Terabyte in SI units, the binary is always going to be 1 TB = 1024 GB, 1 GB = 1024 MB, 1 MB = 1024 KB, 1 KB = 1024 Bytes, 1 Byte = 8 bits.

This of course doesn't invalidate the previous answers about metric system being used for HDD storage marketing and filesystem space utilisation.



Which is why everyone should use the binary prefixes to avoid confusion:

1TiB = 1024 GiB, 1 GiB = 1024 MiB, 1 MiB = 1024 KiB, etc

Not that that'll happen. Too much history in this. :)

25454 posts

Uber Geek
+1 received by user: 5268

Moderator
Trusted
Biddle Corp
Subscriber

  Reply # 725029 30-Nov-2012 09:31
Send private message

freitasm:
sbiddle:
hamish225:
the same thing happens with my terabyte hard drive, it's not a terabyte its 931gb. a TB is 1024GB not 931.


Incorrect.

A terabyte is 1000 gigabytes in using standard SI units or 931 gibibytes in binary.


Nope. While 1000 Gigabtyes is 1 Terabyte in SI units, the binary is always going to be 1 TB = 1024 GB, 1 GB = 1024 MB, 1 MB = 1024 KB, 1 KB = 1024 Bytes, 1 Byte = 8 bits.

This of course doesn't invalidate the previous answers about metric system being used for HDD storage marketing and filesystem space utilisation.



Sorry didn't make that clear. What I was meaning was that a 1000GB SI drive has 931 gibibytes of capacity which is the capacity you get when you format it with a typical file system.

3067 posts

Uber Geek
+1 received by user: 840

Trusted

  Reply # 725052 30-Nov-2012 10:24
Send private message

sbiddle:

Sorry didn't make that clear. What I was meaning was that a 1000GB SI drive has 931 gibibytes of capacity which is the capacity you get when you format it with a typical file system.


Which is correct and illustrates where the standardised binary prefixes are less confusing in distinguishing between the two:

1TB = 1000GB = 1 000 000 MB = 1000 000 000 KB = 1000 000 000 000 Bytes = 976 562 500 KiB = 953 674 MiB = 931 GiB

But given they've barely been adopted at all in the hardware\software industry the confusion is just something we live with.

2054 posts

Uber Geek
+1 received by user: 473


  Reply # 725053 30-Nov-2012 10:28
Send private message

Mac OS now reports the Metric value of the drive to the user.  So a 1TB drive looks like a 1TB drive in the OS.  So I guess if you don't want to keep 'losing' HDD space, buy a Mac!

3067 posts

Uber Geek
+1 received by user: 840

Trusted

  Reply # 725054 30-Nov-2012 10:29
Send private message

macuser: Mac OS now reports the Metric value of the drive to the user.  So a 1TB drive looks like a 1TB drive in the OS.  So I guess if you don't want to keep 'losing' HDD space, buy a Mac!



Until you actually try and put 1TiB of files onto that drive? Or does it report file sizes in that way too? :)

2054 posts

Uber Geek
+1 received by user: 473


  Reply # 725058 30-Nov-2012 10:36
Send private message

Yep it reports everything in Metric, so if you compared a file on a MacOS machine to a Win machine, you would find the file is slightly larger on the Mac.



1300 posts

Uber Geek
+1 received by user: 165


  Reply # 725148 30-Nov-2012 13:54
Send private message

oh that's interesting, i was always told it was because hard drive manufacturers were stingy.

What's stopping them from using the same system that Microsoft use?

also, why is there more than one system?





BDFL - Memuneh
58928 posts

Uber Geek
+1 received by user: 10298

Administrator
Trusted
Geekzone
Subscriber

13228 posts

Uber Geek
+1 received by user: 1560


  Reply # 725161 30-Nov-2012 14:49
Send private message

I would have thought that these days they would just make the drives slightly larger so when people connected them up, they would read as a round number and match that quoted on the packaging. It would at the least cut down on the number of people complaining about this. I get asked this question all the time still. I think they do usually have something printed on the box if you buy an external drive.

2771 posts

Uber Geek
+1 received by user: 118


  Reply # 725180 30-Nov-2012 15:15
Send private message

Most drives will say how the measurement is derived on them, or at least, the last few WD units I've bought do.

1.44MB floppies wouldn't store 1.44MB either. This isn't a new "problem".




 1 | 2
View this topic in a long page with up to 500 replies per page Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Vodafone TV — television in the cloud
Posted 17-Oct-2017 19:29


Nokia 8 review: Classy midrange pure Android phone
Posted 16-Oct-2017 07:27


Why carriers might want to embrace Commerce Commission study, MVNOs
Posted 13-Oct-2017 09:42


Fitbit launches Ionic, its health and fitness smartwatch
Posted 12-Oct-2017 15:52


Xero launches machine learning automation to improve coding accuracy for small businesses
Posted 12-Oct-2017 15:45


Bank of New Zealand uses Intel AI to detect financial crime
Posted 12-Oct-2017 15:39


Sony launches Xperia XZ1, a smartphone with real-time 3D capture
Posted 11-Oct-2017 10:26


Notes on Nokia’s phone comeback
Posted 10-Oct-2017 10:06


Air New Zealand begins Inflight Wi-Fi rollout
Posted 9-Oct-2017 20:16


The latest mobile phones in perspective
Posted 9-Oct-2017 18:34


Review: Acronis True Image 2018 — serious backup
Posted 8-Oct-2017 11:22


Lenovo launches ThinkPad Anniversary Edition 25
Posted 7-Oct-2017 23:16


Less fone, more tech as Vodafone gets brand make-over
Posted 6-Oct-2017 08:16


API Talent Achieves AWS MSP Partner Status
Posted 5-Oct-2017 21:20


Stellar Consulting Group now a Domo Partner
Posted 5-Oct-2017 21:03



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.