On 7/24/23 14:44, Geoffrey Leach wrote:
Fedora 37, up-to-date
Controller JMicron Technology
Medium 1TB SanDisk ultra SD, sped transfer rate 120MB/sec
DATA 155MB
df /Media/SDXC says its 26% full
% mount /Media/SDXC
% time cp DATA /Media/SDXC
real 0m0.145s
user 0m0.001s
sys 0m0.41s
% time cp DATA /Media/SDXC
real 2m44.656s
user 0m0.002s
sys 0m0.211s
I assume that the first cp just 'fills the queue, but even assuming
that I then have 310MB transferring, that's pretty slow.
The SD card may support that speed, but the reader might not. Try
running "iostat 1" in another window to see what the actual speeds are.
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