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тАО08-11-2006 07:47 AM
тАО08-11-2006 07:47 AM
Formating for a 146GB SCSI drive
I have a 146GB Ultra3 SCSI drive. The array controller sees it as 140GB after I create it as a logical drive (Raid 0). Windows 2003 server sees it as a 136GB drive.
Why am I loosing 10GB of space in this process. I can see having some overhead and loosing a few gig but 10 seems too high. What am I missing?
Thanks,
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тАО08-11-2006 07:49 AM
тАО08-11-2006 07:49 AM
Re: Formating for a 146GB SCSI drive
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тАО08-11-2006 08:52 AM
тАО08-11-2006 08:52 AM
Re: Formating for a 146GB SCSI drive
To begin with the HDD manufacturers call a Gigabyte something different to the rest of us. To them 1Gb = 1000Mb, when the rest of us know 1Gb is actually 1024Mb.
Next up there's the RAID overhead of creating the array. Then on top of that you have the file system overhead when you format the drive, probably NTFS in your instance within the O/S.
You will never get what it says on the HDD as usable space, you always loose a few percent when all these overheads are added together.
Hope this helps,
Jeff
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тАО08-11-2006 09:03 AM
тАО08-11-2006 09:03 AM
Re: Formating for a 146GB SCSI drive
Thanks for your help.
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тАО08-11-2006 10:55 AM
тАО08-11-2006 10:55 AM
Re: Formating for a 146GB SCSI drive
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тАО08-12-2006 04:48 AM
тАО08-12-2006 04:48 AM
Re: Formating for a 146GB SCSI drive
146000000000 /1024*1000 /1024*1000 /1024*1000 =
135973095000
Let's take another example:
what is the difference between:
10 | 1010 | 0A | 12
or better:
10(10) | 1010(2) | 0A(16) | 12(8)
Answer: there is none!
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тАО08-12-2006 06:19 AM
тАО08-12-2006 06:19 AM
Re: Formating for a 146GB SCSI drive
http://en.wikipedia.org/wiki/Binary_prefix
If you are talking about a GIGABYTE, then that is 1000 MB. However, a new term has been coined, GIBIBYTE, which is 1024MB.
See the section in the link above where it talks about the IEC standard prefixes. What most of us have always called a Gigabyte, is technically a Gibibyte.
So your 146GB drive, is 146,000 MB, or 146,000,000 KBYTES or 146,000,000,000 Bytes.
If converted into it's binary (where 1GiB is 1,024 MiB) then you actually have 146,000,000 KB / 1024 = 142,578.125 Mibibytes. 142,578.125 MiB / 1024 = 139.236 Gibibyptes.
So, technically you are not losing as much as you think.
There have apparently been some lawsuits against major manufacturers about inflating their HDD capacity claims. See the footnotes in the link above for information.
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тАО08-14-2006 04:50 AM
тАО08-14-2006 04:50 AM