mercredi 4 mars 2015

dd'ing SDD, decreasing write speed


My hard drive is a SanDisk SSD. The drive is new. I've booted into ArchLinux Live System, with the intention of preparing the hard drive for full disk encryption. I've noticed a significant drop of write speed over time, see image:


...


The same issue can also be observed when dd'ing directly from /dev/zero to /dev/sda.


Is this a usual behavior when dd'ing SSDs? Is there a wrong setting in the configuration/BIOS? Or is the SSD broken?



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