[Qemu-devel] Question about maximum disk size of a dynamic hard disk

[Qemu-devel] Question about maximum disk size of a dynamic hard disk

[Lyu Mitnick]

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Hello Kevin, Stefan and all

There is a sentence "The maximum size of a dynamic hard disk is 2040 GB.
The actual size is restricted by the underlying disk hardware protocol. For
example,
ATA hard disks have a 127-GB limit" in VHD specification. This limitation
infected the
algorithm of block/vpc.c:calculate_geometry(). However, SATA disk is used
to
replace traditional IDE disk now. I am wondering whether is possible to
support that
VHD is bigger than 127-GB(SATA disk underlying)??

Thanks

Mitnick

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Re: [Qemu-devel] Question about maximum disk size of a dynamic hard disk

[Kevin Wolf]

Am 13.04.2011 14:47, schrieb Lyu Mitnick:
> Hello Kevin, Stefan and all
> 
> There is a sentence "The maximum size of a dynamic hard disk is 2040 GB. 
> The actual size is restricted by the underlying disk hardware protocol.
> For example, 
> ATA hard disks have a 127-GB limit" in VHD specification. This
> limitation infected the
> algorithm of block/vpc.c:calculate_geometry(). However, SATA disk is
> used to 
> replace traditional IDE disk now. I am wondering whether is possible to
> support that
> VHD is bigger than 127-GB(SATA disk underlying)??

The important thing is here really what VirtualPC can handle. I think
when I implemented qemu's write support for VHD back then, I wasn't able
to get VPC to cope with large images. If you want to know whether this
limitation still makes sense with current VPC versions, you need to
install VPC and try it out.

Kevin