FG

dd gets slower while reading and writing

Fresh3 days ago
Mar 15, 20267648 views
Confidence Score0%
0%

Problem

user@user-laptop:~$ sudo dd if=sd_backup of=/dev/sdd bs=4M conv=noerror,sync How come dd gets slower after copying this 8GB file? What can I do about it?

Error Output

205520896 bytes (206 MB) copied, 28.564 s, 7.2 MB/s
247463936 bytes (247 MB) copied, 57.1285 s, 4.3 MB/s
260046848 bytes (260 MB) copied, 73.2388 s, …

Unverified for your environment

Select your OS to check compatibility.

1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Fix for: dd gets slower while reading and writing

Low Risk

At first, it's showing wrong numbers, because Linux caches your writes. Also disk caches may speed up reading. After a while caches are consumed (both read and write) and speed drops. calculates overall speed, so then it looks like speed is dropping…

Awaiting Verification

Be the first to verify this fix

Sign in to verify this fix

Environment