[arch-general] Super weird dd problem.

[Toyam Cox]

On Sun, Jun 9, 2013 at 5:23 PM, Alfredo Palhares
<masterkorp at masterkorp.net>wrote:
Hello,

So I was creating a archlinux usb bootable drive:

[root at masterkorp-laptop Downloads]# dd bs=4M
if=archlinux-2013.06.01-dual.iso of=/dev/sdb
130+1 records in
130+1 records out
548405248 bytes (548 MB) copied, 0.964976 s, 568 MB/s

I was like WOW, this was too fast! But nothing ever gets written to
the pen drive.
To add to the weird factor, a dd to dev/sdb1 (partition) works as it
should, slowly. But then ofcourse the iso gets unbootable.

The md5sum on the iso is correct.
I tried with diferent pen drives.

Please, any suggestions is welcome.

--
Regards,
Alfredo Palhares

When I first learned DD, to create bootable disks, 1M was the suggested
size because you could manage to miswrite with something larger. The
caution was: "Use 1M to restrict your speed so that it writes properly"
which I never actually understood, but never had a problem with. Only
recently have I seen the suggestion to use 4M, but always with 1M as the
fallback option if it doesn't work.

-- 
- Toyam