Re: Could RAM possibly be just 3-4 times faster than bare hdd ...
Hi,
all your dd runs are allowed to make heavy use of RAM buffering.
If you are interested in the speed of the storage device, add option
oflag=dsync
to the dd run.
I use dd options
bs=1M status=progress oflag=dsync
in order to get realistic pacifier messages when copying ISOs to USB stick.
The overall time until a 35 MB/s stick stops blinking is not longer than
without those options. Just progress is smooth and dd does not end before
the stick is done with blinking.
Maybe bs=4K is a bit small for oflag=dsync and unrealistic in comparison
to Linux kernel behavior about disk i/o.
Have a nice day :)
Thomas
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