• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 406
  • Last Modified:

how come a Seagate ATA 300GB harddisk only appear to be 279GB ?


I just purchased a SEAGATE ATA 300GB harddisk.

When I placed into my PC, wanted to format it, it appeared to be 279GB ?

is that any way , method  or utilityi can get to around 300GB .

Thanks
0
fox404
Asked:
fox404
  • 4
1 Solution
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
It is 300 GB.  Where 1 GB = 1,000,000,000 bytes.  Problem is, to the computer, 1 GB = 1,073,741,824 bytes (2 to the power of 30).  But the hard drive makers can say 300 GB which sounds better if they measure it in even numbers like 1,000,000,000 bytes.
0
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
Just for example: - multiply 1,073,741,824 by 279 "GB" and you get 299,573,968,896 - figure The computer rounds down, the drive is logically probably 279.4 GB, which is 300,003,465,625 (or so) bytes.
0
 
fox404Author Commented:

but why, if i boot up, in my bios, the hdd only give 135GB ?
0
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
Your BIOS may be limited to 128 GB (in computer GB, not Marketing GB).  You may need to upgrade the BIOS.

You might also need to install a Service Pack.  What OS are you using?  XP?  2000?  XP Requires SP1 OR 2, 2000 I believe needs SP3 OR 4.  

For more info:
Windows 2000:
http://support.microsoft.com/kb/305098/EN-US/

Windows XP:
http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B303013

BIOS depends on your computer brand/motherboard brand

Maxtor related tips:
https://maxtor.custhelp.com/cgi-bin/maxtor.cfg/php/enduser/olh_adp.php?p_faqid=960&&p_sid=j-TYG7jh&p_lva=

Some outdated, but otherwise interesting info:
http://www.stud.fernuni-hagen.de/q3998142/pcchips/howto/hdds.html
http://www.pcguide.com/ref/hdd/bios/sizeGB128-c.html



0
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
Can you explain why the A grade?  What part of my answer did you have a problem with?
0

Featured Post

Prep for the ITIL® Foundation Certification Exam

December’s Course of the Month is now available! Enroll to learn ITIL® Foundation best practices for delivering IT services effectively and efficiently.

  • 4
Tackle projects and never again get stuck behind a technical roadblock.
Join Now