gmirror, gpart and MBR vs GPT in the Handbook
wblock at wonkity.com
Mon Dec 2 21:21:51 UTC 2013
On Mon, 2 Dec 2013, Mike. wrote:
> My understanding is that MBR can be used with drives only up to
> and including 2TB in size. So if I use MBR, the maximum drive
> size I could use would be 2TB. Is that correct?
As far as I recall, MBR expects 512-byte blocks and uses 32-bit values.
The total number works out to 2TB (2^32*512).
Just recently, someone in the forums had an external drive, MBR format,
but 4K blocks. There were problems, although I don't know if FreeBSD
was at fault.
I have not tried MBR on a drive larger than 2TB. I suspect it would be
safe to use the first 2TB and ignore the rest, but that really ought to
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