How to judge how long it takes to read and write files in the ls directory by the read and write speed of the hard disk?

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my hard disk speed is as follows. How long will it take to have 10000 files in the ls directory

time dd bs=64k count=4k if=/dev/zero of=test oflag=dsync 
4096+0 
4096+0 
268435456(268 MB)32.583 8.2 MB/

real    0m32.584s
user    0m0.012s
sys    0m0.896s

Linux-operation-and-maintenance centos

Sep.16,2021

this also depends on whether other programs are reading the hard drive

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