On Tue, Mar 17, 2020 at 02:22:36PM -0500, Dale wrote: > Thanks for the additional info. As I figured, they got most of the > kinks worked out by now and we got some dependable SSDs to buy. > > I found a 240GB for a little over $42.00 USA. Not bad at all. For > those curious:
Careful, you get what you pay for. When I built my first PC from scratch (had laptops before that), I bought a 128 GB Sandisk SDSSDP128G. I didn’t have a lot of money back then, it was relatively cheap, but not the very cheapest. It doesn’t even have real branding to speak of. No series or model name, just a label with “Sandisk”. I’ve been using it for 5 years for a dual-boot system (2×64 G for Windows and Gentoo). By the end of last year it became slower and slower when writing. Especially eix-update became sloooow. My main suspicion is that it was quite full and there probably is no overprovisioning for wear-leveling built into the drive. So it was writing the same cells over and over when I did my world updates. > Sandisk SDSSDA240GG26 > > Should last me a good long while. It's the /home that keeps growing. o_O When I built my NAS 2 years ago, I wanted the cheapest (but still from a notable brand) SSD for the OS. So I bought a Sandisk SDSSDA120G, so apparently from the same series you mentioned. A simple read test with hdparm -t reveals: 500 GB Crucial from 2016: Timing buffered disk reads: 1596 MB in 3.00 seconds = 531.46 MB/sec 128 GB Sandisk from 2014: Timing buffered disk reads: 1532 MB in 3.00 seconds = 510.60 MB/sec 120 GB Sandisk from 2017: Timing buffered disk reads: 968 MB in 3.00 seconds = 322.42 MB/sec The theoretical maximum of SATA-III is around 550 MB/s. As you can see, even a very simple read test already shows a considerable performance drop, even though it is the newest in the bunch (by date of purchase). A good SSD should always be able to saturate SATA-III when reading. Most do. Sequential writing on the cheap Sandisk topped off at around 90 MB/s, IIRC. This is slower than an HDD. For a NAS system drive this is enough, but not for a desktop, methinks. So my message is: don’t by the cheapest. -- Gruß | Greetings | Qapla’ Please do not share anything from, with or about me on any social network. A good position is better than any job.
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