Re: Booting native 4K SSD disk from FreeBSD ?

From: Allan Jude <>
Date: Tue, 3 Oct 2017 17:36:59 -0400
On 10/03/2017 17:18, Hans Petter Selasky wrote:
> Hi,
> I accidentially ordered a Sata SSD disk which diskinfo reports a
> sector-size 4K instead of 512 bytes. Trying to get it to boot under
> FreeBSD appeared impossible. Then I started looking into the boot0,1,2
> and loader and the assumptions they make about 512 byte sector size LBA :-(
> Anyone has any recommendations or experience about how to use native 4K
> disks with FreeBSD?
> --HPS
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It is not possible in legacy/BIOS mode, because the BIOS calls do not
let you specify a sector size.

However, you SHOULD be able to boot from the 4k device using UEFI.
I am trying to debug a problem I am having with this on my new Mac,
which has a 4k NVMe disk.

Allan Jude
Received on Tue Oct 03 2017 - 19:35:46 UTC

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