== SSDHDD ==
=== Solid State Drive / Hard Disk Drive comparison ===
I have older Western Digital 1 terabyte SATA hard disk drives (5 inch WD10EZEX) in some tower PCs, running ancient CENTOS Linux.  Those drives will be replaced with Samsung 1 terabyte SATA solid state drives (3 inch 870 EVO) running Debian 12 Bookworm, probably upgraded to Debian 13 Trixie in late 2025.

Here's a rough comparison between the two drives:

|| 1 TB          || WD10EZEZ    || 870EVO      ||
|| inches        || 5.7x4.0x1.0 || 4.0x2.8x0.3 ||
|| weight        || 450g        || 46g         ||
|| rpm           || 7200 rpm    || na          ||
|| read          || ≤ 150 MB/s  || 560 MB/s    ||
|| write         || ≤ 150 MB/s  || 530 MB/s    ||
|| seek avg/max  || 9ms / 21ms  || na          ||
|| idle power    || 6W          || 0.03W       ||
|| active power  || 12W         || 2.5W        ||
|| start power   || 25W         || na          ||
|| MTBF          || 0.6 Mhour   || 1.5 Mhour   ||
|| price 2025/01 || $40-$60     || $80-$100    ||
||<-3> largest drives available, early 2025    ||
||               || Western D.  || Nimbus SSD  ||
||               || EXOS        || EDDCT100    ||
|| capacity      || 32 TB       || 100 TB      ||
|| price         || $869        || $40000      ||

The Samsung 870 EVO 4TB SSD is $298.  My work tasks don't need that much storage.  My [[ http://dirvish.org | rsync/dirvish]] backups need more.

https://diskprices.com  and  https://nimbusdata.com

My experience - the much faster speed of SSD helps me get more done.  Debian boot-to-prompt is less than 10 seconds, shutdown is 1 second.  I hope to arrange 10 second "suspend-with-reminders", so I can power down machines for short breaks, without interrupting workflow.