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Groups > comp.sys.ibm.pc.hardware.storage > #6427

Re: Cannot access new Seagate external HD

Cross-posted to 2 groups.

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In article <d5nhgjF9tvlU1@mid.individual.net>, VanguardLH wrote:
> http://www.seagate.com/support/downloads/beyond-2tb
> http://www.paragon-software.com/hgst/index.html
> 
> You must use some windowed or overlayed access to the >2TB disk.
> There have been disk managers like this for long time: another
> showing every time another disk or BIOS boundary gets hit as
> manufacturers keep producing bigger disks.

Ah, Disk Managers ... there's a blast from the past. I remember having 
to install a disk manager to use a 1.3GB HDD on a Toshiba 486 notebook.

You don't /usually/ have to resort to such things, these days, but I 
guess using a HDD >2TB on a legacy XP system is not a usual case.

> Some do not run as a driver inside of the OS
> but instead usurp the MBR bootstrap code.  They overcome the MBR
> partition record limitation of 2^32 but how is FM to me.

I'd guess that they don't. If you're using a disk manager you can store 
your own partitioning information somewhere other than the MBR in any 
format you please ... and you can use 64-bit partition addresses to get 
around the 2TB limitation. I notice that each partition *size*, under 
the Seagate scheme, is still limited to 2TB, which must be so that any 
volume size limits inside the OS are still honoured.

The first partition on the HDD would be the system partition, and it 
would be described by a normal partition table in the MBR. The OS would 
boot from that partition and load a driver that knew where to look for 
the second and subsequent partitions (because the partition table 
couldn't store their locations). There'd probably be a special 
partition table in a format the Disk Manager software understood in a 
normally unused part of the disk (such as sector 2, the sector 
immediately following sector 1, in the unused area before the start of 
the OS)

Disk managers work well enough in most cases, but I shouldn't be at all 
surprised to learn that they fail with (say) dual-boot systems, or 
systems with encryption software (which typically also uses sector 2).

> Your layering in software to handle what the OS and/or BIOS
> cannot handle.  I prefer hardware solutions, if available, like
> getting a UEFI mobo and using a newer OS that are designed to pair
> well.

Agreed!

-- 
Cheers,
 Daniel.
 

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Thread

Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-10 19:20 +0100
  Re: Cannot access new Seagate external HD Chronos <usenet@chronos.org.uk> - 2015-09-10 19:50 +0100
    Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-10 20:11 +0100
      Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-10 20:46 +0100
        Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-10 21:07 +0100
          Re: Cannot access new Seagate external HD Chronos <usenet@chronos.org.uk> - 2015-09-10 22:10 +0100
          Re: Cannot access new Seagate external HD Mike Tomlinson <mike@jasper.org.uk> - 2015-09-11 00:22 +0100
      Re: Cannot access new Seagate external HD Mike Tomlinson <mike@jasper.org.uk> - 2015-09-11 00:16 +0100
        Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-11 07:16 +0100
          Re: Cannot access new Seagate external HD Daniel James <daniel@me.invalid> - 2015-09-11 15:17 +0100
          Re: Cannot access new Seagate external HD Shadow <Sh@dow.br> - 2015-09-11 11:30 -0300
          Re: Cannot access new Seagate external HD Mark Perkins <mark@none.invalid> - 2015-09-11 09:35 -0500
            Re: Cannot access new Seagate external HD Mike Tomlinson <mike@jasper.org.uk> - 2015-09-11 21:22 +0100
  Re: Cannot access new Seagate external HD Shadow <Sh@dow.br> - 2015-09-10 16:18 -0300
    Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-10 21:08 +0100
  Re: Cannot access new Seagate external HD Ed Light <nobody@nobody.there> - 2015-09-10 14:30 -0700
  Re: Cannot access new Seagate external HD micky <NONONOmisc07@bigfoot.com> - 2015-09-10 21:17 -0400
    Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-11 07:23 +0100
  Re: Cannot access new Seagate external HD VanguardLH <V@nguard.LH> - 2015-09-10 21:11 -0500
    Re: Cannot access new Seagate external HD Daniel James <daniel@me.invalid> - 2015-09-11 15:17 +0100
      Re: Cannot access new Seagate external HD VanguardLH <V@nguard.LH> - 2015-09-12 05:18 -0500
        Re: Cannot access new Seagate external HD Daniel James <daniel@me.invalid> - 2015-09-12 20:46 +0100
          Re: Cannot access new Seagate external HD VanguardLH <V@nguard.LH> - 2015-09-14 04:14 -0500
            Re: Cannot access new Seagate external HD Daniel James <daniel@me.invalid> - 2015-09-14 13:03 +0100
            Re: Cannot access new Seagate external HD Mark Perkins <mark@none.invalid> - 2015-09-14 21:10 -0500
  Re: Cannot access new Seagate external HD Daniel James <daniel@me.invalid> - 2015-09-11 15:17 +0100
    Re: Cannot access new Seagate external HD Terry Pinnell <me@somewhere.invalid> - 2015-09-12 07:05 +0100

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