On Fri, Sep 13, 2024 at 08:33:55PM +0200, to...@tuxteam.de wrote:
tomas@caliban:~$ time sudo dd if=/dev/zero of=/dev/sdb bs=1M ; time sync
dd: error writing '/dev/sdb': No space left on device
15268+0 records in
15267+0 records out
16008609792 bytes (16 GB, 15 GiB) copied, 3614.25 s, 4.4 MB/s
real 60m14.260s
user 0m0.005s
sys 0m0.007s
real 0m0.077s
user 0m0.002s
sys 0m0.000s
I interpret that this way: after 16G of dd (the stick is 16G) there isn't
a significant amount of buffers lying around waiting to be flushed to the
stick (it's a slow USB, as suggested by the 60m the dd took, so if there
were a lot of buffers, we'd see more than .077 sec for the sync).
It's an invalid test because you hit the end of the device; there's
nothing left to sync.
