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Old 06-25-2012, 03:27 PM   #61
unitron
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Quote:
Originally Posted by BobCamp1 View Post
Yes, I did. I was only off by one letter.

I don't remember if pdisk -l will output using sector numbers (vs. cylinder numbers). I don't know if the 'u' parameter will work, but all it does is force fdisk to output using sector numbers. If pdisk -l already does that, then it's not needed.

pdisk is on the MFSLive CD:

http://www.mfslive.org/softwareguide...#diskpartition
Actually both

pdisk

and the Linux version of

fdisk

are on there, along with some other utilities with which one can also quickly get into trouble, like

hdparm

and

dd

and

dd_rescue

But they can, at times, also be lifesavers.
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Old 06-25-2012, 05:42 PM   #62
lessd
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Originally Posted by BobCamp1 View Post
There's a hard 2 TB limit using MBR. That limit doesn't exist using GPT.

Generally speaking, hard drives larger than 2 TB tend to have Advanced Formatting for practical reasons, but they're not required to.

FYI, BIOS only supports MBR which is why you couldn't boot using GPT as is. UEFI (BIOS's replacement) supports booting from GPT. Most Sandy-Bridge PCs support UEFI, though they may not state it in their manual.

There are various work-arounds to this, which basically fool the BIOS into thinking there is a bootable MBR partition with valid CHS parameters. That prevents the BIOS from throwing an error. Windows 7 takes over immediately after that, recognizes it's really a GPT drive, and boots the rest of the way.
Thanks for that information, now I have a better understanding of these large hard drives, as my computer is 2.5 years old and uses the LGA1366 socket for my I7 I assume I don't have UEFI on this computer.
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Old 06-26-2012, 12:00 PM   #63
BobCamp1
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Quote:
Originally Posted by lessd View Post
Thanks for that information, now I have a better understanding of these large hard drives, as my computer is 2.5 years old and uses the LGA1366 socket for my I7 I assume I don't have UEFI on this computer.
No problem. Most people don't know you really shouldn't buy a hard drive greater than 2 TB today. It just causes more problems than it solves. Maybe in a couple of years, once PCs and operating systems and third-party tools support it better.

Anyway, it's a definite no-no for a Tivo, which uses APM (same limits as MBR).

Last edited by BobCamp1 : 06-26-2012 at 12:09 PM.
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Old 06-26-2012, 12:24 PM   #64
BobCamp1
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Quote:
Originally Posted by BobCamp1 View Post
Yes, I did. I was only off by one letter.

I don't remember if pdisk -l will output using sector numbers (vs. cylinder numbers). I don't know if the 'u' parameter will work, but all it does is force fdisk to output using sector numbers. If pdisk -l already does that, then it's not needed.

pdisk is on the MFSLive CD:

http://www.mfslive.org/softwareguide...#diskpartition
I looked online and found this partition table for the Series 1 (which is also what I have):


1 Apple_partition_map Apple 63 @ 1
2 Image Bootstrap 1 4096 @ 37893184 2.0M
3 Image Kernel 1 4096 @ 37897280 2.0M
4 Ext2 Root 1 262144 @ 37901376 128.0M
5 Image Bootstrap 2 4096 @ 38163520 2.0M
6 Image Kernel 2 4096 @ 38167616 2.0M
7 Ext2 Root 2 262144 @ 38171712 128.0M
8 Swap Linux swap 260096 @ 38433856 127.0M
9 Ext2 /var 262144 @ 38693952 128.0M
10 MFS MFS application region 1048576 @ 38956096 512.0M
11 MFS MFS media region 37893120 @ 64 18.1G
12 MFS New MFS Application 1024 @ 40004672
13 MFS MFS New MFS Media 194428928 @ 40005696 92.7G
14 Apple_Free Extra 7024 @ 234434624 3.4M


All of those sector numbers (except the partition map itself) are divisible by 8, so a Series 1 is already aligned to support an Advanced Format drive. But I think they changed the partition layout in the Series 2 Tivos (and beyond).
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