I was able to boot 12.0beta3 with both legacy (BIOS/MBR) and UEFI from a
thumb drive written with:
dd if=osgeolive-12.0beta3-amd64.iso of=/dev/sdX bs=8M; sync
Everything seemed to work fine.
I am using a recent Asus UEFI BIOS with Legacy boot support enabled. The
thumb drive is an ancient Intel 8 GB USB 2, on a USB 3 port.
Kind regards,
Ben.
On 17/08/18 14:35, Ben Caradoc-Davies wrote:
Actually that verification will not work because dd bs is limited to
about 2 GiB (signed 32-bit?). The solution is to use "head -c", or
because in this case the image size is an exact multiple (502) of 8 MiB,
bs=8M count=502. The source confirms that the size argument to head is
size_t (64-bit on amd64). This also stops trying to load the whole image
into memory.
Wrong:
# dd if=/dev/sdb bs=4211081216 count=1 | md5sum
0+1 records in
0+1 records out
2147479552 bytes (2.1 GB, 2.0 GiB) copied, 111.671 s, 19.2 MB/s
d115d027efbf43eaba4ff2589aab17e8 -
Right (dd reading a bit more than the image size):
# dd if=/dev/sdb bs=1G count=4 | head -c 4211081216 | md5sum
83a07dc571b7810495f0835e5f390ab8 -
Right (image size is an exact multiple of 8 MiB):
# dd if=/dev/sdb bs=8M count=502 | md5sum
502+0 records in
502+0 records out
83a07dc571b7810495f0835e5f390ab8 -
4211081216 bytes (4.2 GB, 3.9 GiB) copied, 225.907 s, 18.6 MB/s
On 17/08/18 11:57, Ben Caradoc-Davies wrote:
And if you know the md5sum and exact size size in bytes of the source
image, and have enough memory, you can also verify the write:
sudo dd if=/dev/sdX bs=4211081216 count=1 | md5sum
$ ls -l osgeolive-12.0beta3-amd64.iso
-rw-rw---- 1 ben ben 4211081216 Aug 17 11:40
osgeolive-12.0beta3-amd64.iso
$ md5sum osgeolive-12.0beta3-amd64.iso
83a07dc571b7810495f0835e5f390ab8 osgeolive-12.0beta3-amd64.iso
$ cat osgeolive-12.0beta3-amd64.iso.md5
83a07dc571b7810495f0835e5f390ab8 osgeolive-12.0beta3-amd64.iso
Kind regards,
Ben.
On 17/08/18 11:09, Ben Caradoc-Davies wrote:
Have you tried writing the raw ISO with dd?:
sudo dd if=osgeolive-12.0beta3-amd64.iso of=/dev/sdX bs=8M; sync
--
Ben Caradoc-Davies <[email protected]>
Director
Transient Software Limited <https://transient.nz/>
New Zealand
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