Below is all about SSD replaced via RMA March 2019 (original purchased July 2018). Before receiving fresh RMA authorization from PNY, similar using two different PCs: /dev/sda: Timing cached reads: 13832 MB in 1.99 seconds = 6940.82 MB/sec Timing buffered disk reads: 158 MB in 3.03 seconds = 52.19 MB/sec After receiving RMA authorization from PNY, in preparation to return, wiping from /dev/zero the first 64 sectors, writing a new SSD GPT tables with 12 partitions, then wiping the first one of 7777 GB, and neither formatting nor attempting to mount any of them: # hdparm -tT /dev/sdh /dev/sdh: Timing cached reads: 16440 MB in 1.99 seconds = 8253.75 MB/sec Timing buffered disk reads: 1304 MB in 3.00 seconds = 434.25 MB/sec When originally tested, hdparm -tT reported 8923 & 538 MB/sec. Fstrim has been run weekly via timer. Is there something about normal or abnormal usage that could account for the vastly reduced speed after 11 month's 24/7 uptime, then be significantly, but not entirely, relieved by clearing the existing partitions and writing new tables? Is there any reason not to proceed with the return -- Evolution as taught in public schools, like religion, is based on faith, not on science. Team OS/2 ** Reg. Linux User #211409 ** a11y rocks! Felix Miata *** http://fm.no-ip.com/