4 Replace SSD, write speed is only 133.3MB/s, what is wrong?
Hello. I have imac 27" late 2012 with 3TB fusion drive. About 6 months ago I split my drive into separate drives 3TB HDD and 128MB SSD. I tested the ssd speed using BlackMagic.app, and the disk write speed was 237MB/s a read is 404.5 MB/s.
Today I changed the 3TB HDD for SSD 1TB Samsung 850 PRO. I tested the disk speed, disk write speed is only 133.3 MB/s and read is 519.8 MB/s.
I watched for several videos on youtube channels. All imac late 2012, that had changed drives for ssd, had write and read speeds of around 500 MB.
Why does my disc have a slow write? How to fix it?
Thank you MAJO
Update (03/11/2018)
Write to disk is too slow. Here is print screen.
330 
971 
Who's SSD did you install (Make, Model & Size)
Dan さんによる
I replaced the Apple 3TB Seagate HDD and put in a Samsung 850 PRO SSD 1 TB (model MZ-7KE1T0)
I still have the second original SSD 128 MB.
Marian Brincko さんによる