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 Post subject: Disk size Difference ?? WHY ??
PostPosted: December 12th, 2019, 9:25 
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Joined: December 22nd, 2017, 1:34
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Location: TURKEY
Hello I have a drive which I am testing. I have formatted it and examined in FTK Imager. And partition size seems 156.297.216 sector length. But when I click properties on Windows it says disk size is 80.024.170.496 byte (156.297.208 sector) size. Where comes this 8 sector difference. I think this area is for partition boot code and OS doesnT show this area to user. What is the reason actually?


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 Post subject: Re: Disk size Difference ?? WHY ??
PostPosted: December 12th, 2019, 16:01 
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Joined: September 8th, 2009, 18:21
Posts: 12422
Location: Australia
The IDEMA standard specifies the LBA count as ...

    LBA count = (97,696,368) + (1,953,504 * (Advertised Capacity in GBytes – 50))

So ...

    (97,696,368) + (1,953,504 * (80 – 50)) = 156,301,488 LBAs

That's a difference of 4272 sectors. I suspect that the formatter terminated the partition on a [logical] cylinder boundary.

Could we see the partition table (sector 0) and the volume boot sector?

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 Post subject: Re: Disk size Difference ?? WHY ??
PostPosted: December 12th, 2019, 16:19 
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Joined: February 9th, 2009, 16:13
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Location: Ontario, Canada
I suspect that the 8 sector difference is because the drive uses AF 4K sectors. The higher number is the number of sectors available while the lower number is the maximum sector number.

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 Post subject: Re: Disk size Difference ?? WHY ??
PostPosted: December 12th, 2019, 16:35 
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The OP isn't clear, but AIUI the drive is an 80GB model, in which case it predates AF.

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 Post subject: Re: Disk size Difference ?? WHY ??
PostPosted: December 12th, 2019, 19:27 
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True. Then it makes no sense at all.

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 Post subject: Re: Disk size Difference ?? WHY ??
PostPosted: December 13th, 2019, 1:58 
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Joined: December 22nd, 2017, 1:34
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Location: TURKEY
Hello again

Drive LBA Count is: 156301488 (like fzabkar said)
I have formatted disk and there is just one partition. And when I look at the first sector on FTK Imager it says partition begins at sector 2048 and it is 156297216 sector length.

But when I look at the properties of drive on windows it says 80024170496 byte which equals to 156297208 sector.

I send screenshots. So why there is difference between FTK and windows?


Attachments:
partition.JPG
partition.JPG [ 179.9 KiB | Viewed 2454 times ]
OS size.JPG
OS size.JPG [ 40.61 KiB | Viewed 2454 times ]
MBR.JPG
MBR.JPG [ 301.55 KiB | Viewed 2454 times ]
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