5TB drive only showing as 561.53GB

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  1. Posts : 3,953
    Windows 10 Pro x64, Various Linux Builds, Networking, Storage, Cybersecurity Specialty.
       #21

    Hello Arthur -

    Don't concern yourself with the Driver right now.

    Please continue to follow the rest of Post #17 and use #19 - only if needed.

    Kindly advise.

    Thanks!

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  2. TV2
    Posts : 2,009
    W10 Pro 20H2
       #22

    A disk that lists as RAW indicates a missing or corrupted File Table, which can be also read as uninitialized.

    I suggest that you do a full disk scan on the drive. If a bad sector is in the area of the disk where the file table is then this could cause this problem.

    You could also use the Diskpart Clean All command. This will write all zeros to the drive. (A 5TB will take a very long time).
    Erase Disk using Diskpart Clean Command in Windows 10
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  3. Posts : 3,953
    Windows 10 Pro x64, Various Linux Builds, Networking, Storage, Cybersecurity Specialty.
       #23

    TV2 said:
    A disk that lists as RAW indicates a missing or corrupted File Table, which can be also read as uninitialized.

    I suggest that you do a full disk scan on the drive. If a bad sector is in the area of the disk where the file table is then this could cause this problem.
    LOL That was my backup plan if all else fails. Suggest holding off for now.
      My Computer


  4. TV2
    Posts : 2,009
    W10 Pro 20H2
       #24
      My Computers


  5. Posts : 3,953
    Windows 10 Pro x64, Various Linux Builds, Networking, Storage, Cybersecurity Specialty.
       #25

    @ArthurDent -

    Please see the post by @jumanji below before proceeding further.

    Last edited by Compumind; 27 Jun 2020 at 08:40.
      My Computer


  6. Posts : 9,776
    Windows 10 Home 64bit Version 21H2
       #26

    Hi @ArthurDent,

    The picture of the Toshiba drive in your post #15, carries The AF logo. AF = Advance formatted, where to read large capacity drives in the bygone XP /Win7 era ( no GPT), eight 512 byte sectors are combined to present one logical sector of 4096 bytes size. These drives are formatted as MBR drives and usually come as External drives where the SATA to usb bridge contains a Drive Translation circuit to combine 8X512 bytes into one 4096bytes sector while writing into the drive. While reading the reverse process takes place wherein the data coming from one 4096 byte sector is reconverted to make it look like it is coming from eight 512 byte sectors..

    If it is formatted as a GPT drive, please use Partition Wizard 12 or even AOMEI Partition Assistant and format it as an MBR drive / convert GPT to MBR.

    (561.53 * 8 = 4492.24GB = 5TB) Your drive seems to be reading 8 sectors as one sector. Drive translation seems to be missing to reconvert one 4096 byte logical sector into eight 512 byte physical sectors.


      My Computer


  7. Posts : 3,972
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #27
      My Computers


  8. Posts : 3,953
    Windows 10 Pro x64, Various Linux Builds, Networking, Storage, Cybersecurity Specialty.
       #28

    jumanji said:
    Hi @ArthurDent,

    The picture of the Toshiba drive in your post #15, carries The AF logo. AF = Advance formatted, where to read large capacity drives in the bygone XP /Win7 era ( no GPT), eight 512 byte sectors are combined to present one logical sector of 4096 bytes size. These drives are formatted as MBR drives and usually come as External drives where the SATA to usb bridge contains a Drive Translation circuit to combine 8X512 bytes into one 4096bytes sector while writing into the drive. While reading the reverse process takes place wherein the data coming from one 4096 byte sector is reconverted to make it look like it is coming from eight 512 byte sectors..

    If it is formatted as a GPT drive, please use Partition Wizard 12 or even AOMEI Partition Assistant and format it as an MBR drive / convert GPT to MBR.

    (561.53 * 8 = 4492.24GB = 5TB) Your drive seems to be reading 8 sectors as one sector. Drive translation seems to be missing to reconvert one 4096 byte logical sector into eight 512 byte physical sectors.
    Wow! That's quite interesting. Didn't even notice the "AF" marking.
    What would happen if the OP tried my suggestions - would it still work? Must it be MBR?

    Certainly the math proves out.

    Thanks!

      My Computer


  9. Posts : 290
    Windows 10 Pro (x64) 21H1 (OS Build 19043.1165)
    Thread Starter
       #29

    TV2 said:
    A disk that lists as RAW indicates a missing or corrupted File Table, which can be also read as uninitialized.

    I suggest that you do a full disk scan on the drive. If a bad sector is in the area of the disk where the file table is then this could cause this problem.

    You could also use the Diskpart Clean All command. This will write all zeros to the drive. (A 5TB will take a very long time).
    Erase Disk using Diskpart Clean Command in Windows 10
    Okay. So yesterday (when this problem surfaced) I tried all sorts of things including re-partitioning and re-formatting the drive (to no avail). So, the data on the drive has gone.

    Compumind said:
    LOL That was my backup plan if all else fails. Suggest holding off for now.
    See above reply.

    Compumind said:
    @ArthurDent -

    Please see the post by @jumanji below before proceeding further.

    Okay. I read this and it *sort* of makes sense, certainly 561GB is approx 1/8 of the formatted capacity of a 5TB drive.

    jumanji said:
    Hi @ArthurDent,

    The picture of the Toshiba drive in your post #15, carries The AF logo. AF = Advance formatted, where to read large capacity drives in the bygone XP /Win7 era ( no GPT), eight 512 byte sectors are combined to present one logical sector of 4096 bytes size. These drives are formatted as MBR drives and usually come as External drives where the SATA to usb bridge contains a Drive Translation circuit to combine 8X512 bytes into one 4096bytes sector while writing into the drive. While reading the reverse process takes place wherein the data coming from one 4096 byte sector is reconverted to make it look like it is coming from eight 512 byte sectors..

    If it is formatted as a GPT drive, please use Partition Wizard 12 or even AOMEI Partition Assistant and format it as an MBR drive / convert GPT to MBR.

    (561.53 * 8 = 4492.24GB = 5TB) Your drive seems to be reading 8 sectors as one sector. Drive translation seems to be missing to reconvert one 4096 byte logical sector into eight 512 byte physical sectors.

    Not sure how to use the above information.

    I asked one of the partition management programs (can't remember which - I tried 3 yesterday) to convert the disk to GPT. How can I find out whether the disk is formatted according to MBR of GPT - through Disk Management?

    Megahertz said:
    Thanks

    Will now try various "solutions" and report back.

    Many thanks for all those folks offering help and suggestions - it is much appreciated!

    Art
      My Computers


  10. Posts : 3,972
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #30

    ArthurDent said:
    I asked one of the partition management programs (can't remember which - I tried 3 yesterday) to convert the disk to GPT. How can I find out whether the disk is formatted according to MBR of GPT - through Disk Management? Art
    Open Disk Manager. On top menu - View - Top - List disk
    Attached Thumbnails Attached Thumbnails 5TB drive only showing as 561.53GB-dm3.jpg  
      My Computers


 

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