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Hard disk reporting incorrectly, Missing 2TB.

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  • Storage
  • Hard Drives
  • External Hard Drive
Last response: in Storage
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June 4, 2014 1:18:56 PM

So, I've been trying to wrap my head around this. This is kind of complicated so try and bear with me.

I've recently bumped my system over to use RAID0 SSD's, and the old backup drive that I was using which used to be an external HDD is now mis-reporting.

Its saying that its got 746gb of un allocated space.

To get this HDD to even work, I had to use a tool (of which i forgot its name, but it was quite powerful but i remember I had to run a dos box to use it) I had to go in, and re-build the part on the HDD that told the computer where everything was, then re-format it to 2048gb.

Heres the trick. Its actually a 3tb hard drive. For whatever reason, it WOULD NOT let me make more than 2tb of it visible. Had something to do with the how i re-built it.

Anyways, now that my system is Raid, the partition that had everything on it is hidden, and the 750 or so GB that was left over is now visible and able to be formatted.

"okay interesting, so how do i get the other 2gb back?"

Thats my question anyway. When I boot the system, it SEES the HDD as a 2.7tb disk. Windows on the other hand only sees 750gb. When I switch my sata controller back to ACHI, it will read both partitions using the windows install disk, (though for some reason i cant merge them).

I've been looking but I cant find the program I used to make the disk work the first time. When I first plugged in the HDD, it was some strange file system, and i forced it to NTSF after having it scan and identify all available sectors.

I've tried a low level format, which did absolutely nothing except i'm sure delete the data I already had. Dont care it was all backed up. It still reports as 746gb.

The storage manager reports the same thing, 746 no hidden partitions.

EaseUS Partition recovery actually saw the data it had on there (it doesnt now after the format) but when i told it to recover the partition, it spent 45 minutes doing nothing, and then said there was no partitions to recover. Yeah okay.

My only conclusion is that that particular section of the HDD needs to be re-written in a format that windows will see, and to do so I need to forcibly go in and order it to be something that works, since windows outright wont acknowledge its even there.

I can post pics, though I dont know how to get pics from boot or windows install. I could just use a camera.

Any help would be greatly appreciated. Thanks in advance!



More about : hard disk reporting incorrectly missing 2tb

a b G Storage
June 4, 2014 1:50:47 PM

since you don't need any of the DATA... Just do a fresh install... when it gets to the point where it asks where do you want to install windows to... click on advanced and delete the partition... repartition It may only let you go to just under 2GB's and format and continue the install.
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June 4, 2014 2:52:38 PM

the problem is that its not acknowledging AT ALL the rest of the data. WINDOWS thinks its a 750gb hdd. Boot knows its not, and I can scan it and show that its got 2.7TB...

Windows disk management, windows installer, and pretty much everything else INSIDE windows just wont even acknowledge its there
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a b G Storage
June 4, 2014 4:33:25 PM

Using the windows DVD you should be fine. fresh install.
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June 4, 2014 10:27:32 PM

anonymous1 said:
Using the windows DVD you should be fine. fresh install.


Dont think people are reading, but incase i didnt clarify...

1) it IS a fresh install. This is new.

2) Windows install is reporting equally wrong results.

Bios knows its all there, it can see it. Windows, for whatever reason, isnt acknowledging the partition.

Running the HDD's in AHCI will reveal the hidden 2TBH, RAID (where my system is built to work) will only show the 750gb i couldnt use before.
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a c 327 G Storage
June 5, 2014 12:24:03 AM

There is a 32-bit LBA limitation in your driver(s).
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a b G Storage
June 5, 2014 8:07:47 AM

I don't think you are hearing me... Do a new fresh install.
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June 5, 2014 4:06:04 PM

anonymous1 said:
I don't think you are hearing me... Do a new fresh install.


I did. Twice. The windows software wont see the partition of the disk that i separated out BEFORE configuring for Raid. Theres nothing on it and I cant interact with it.

What I really need is a tool that will allow me to scan the disk sector by sector. I used one before to fix the hard drive when it wasnt reading initially after i took it out of its external HDD enclosure, but i cant find it or remember what it was called, except that it ran in a dos like interface.
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a c 100 G Storage
June 5, 2014 5:58:56 PM

fzabkar said:
There is a 32-bit LBA limitation in your driver(s).


This is obviously possible. What HDD do you have?
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June 14, 2014 1:43:08 AM

trekzone said:
fzabkar said:
There is a 32-bit LBA limitation in your driver(s).


This is obviously possible. What HDD do you have?


I think I ripped it out of an old Seagate...

BIOS reports:

ST3000DM001 - 1CH166

SN W1F1ZR2C

Size 3000.5GB


Running in ACHI see's the old 2gb partition. I dont care if I have to boot in ACHI with a flash boot of linux or windows to fix it. I did however wipe it through windows install in ACHI, didnt fix the issue.
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June 23, 2014 6:20:58 PM

Well, cool story...

I installed a new 3tb HDD... SURPRISE! Its reading exactly the same...

Guys this is now a serious issue. I'm desperately needing to backup this external since it holds thousands of hours of work.

I've even tried to setup the disks for raid 1, raid 0, and still it reads as a 746GB hdd... Both of them.

I've downloaded and installed Intel Matrix Storage console, and when looking at the drive info, it knows theyre both 2794 gb's each... So I really dont get it...

Please help.
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a c 327 G Storage
June 24, 2014 9:13:04 PM

AHCI and RAID use different drivers. ISTM that your AHCI driver can see 48-bit LBAs, but your RAID driver is limited to 32 bits.
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