[haiku-bugs] Re: [Haiku] #8990: intel partiton addon allows creating partitions > 2TB (easy)
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Mon, 26 Jan 2015 12:42:58 -0000
#8990: intel partiton addon allows creating partitions > 2TB (easy)
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Reporter: luroh | Owner: bonefish
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Partitioning Systems/Intel | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 1 | Platform: All
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Comment (by pulkomandy):
Replying to [comment:17 kushalsingh007]:
> An example that blocksize is not always indeed not 512 can be seen when
you try to format the given space to Be File System ( you choose a value
of BlockSize for the same) , and then once it's done then you try to
Initialize Intel partition Map. You will notice there that
partition->BlockSize() is going to return the value chosen by you (not
512),
Then there is a bug there. The intel partition map would erase the BFS
volume in that case, and it should use the physical block size of the
disk.
I don't know if it's correct to allow MBR on disks which expose 4K sectors
(note that most consumer grade disk don't, they use "512e" and expose 512
byte sectors to the BIOS and OS), and I don't know what sector size the
MBR should be using in that case. If we want to be safe, we shouldn't
allow use of MBR when sectors are not reported as 512 bytes by the drive,
at least until we can find reliable information on how this is handled by
the BIOS, our MBR code (I'm fairly sure we don't allocate 4K RAM for the
sector to read there), and the stage1 loader and makebootable, as well as
the kernel and the ata driver. (see
http://en.wikipedia.org/wiki/Advanced_Format#512e , and the following
section on "4K native drives").
So, I would suggest not allowing use of the MBR on non-512 byte drives
until these possible problems have been investigated and we know for sure
the system can boot off a drive which exposes 4K sectors.
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Ticket URL: <https://dev.haiku-os.org/ticket/8990#comment:18>
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