I have three of the Black type and two Blue type 2.5" drives. The Black drives are running significantly slower than the Blue ones based on the CrystalDisk 6.0.0 utility. I have:
2 WD7500BPKX-00HPJT0 Black
1 WD10JPLX-00MBPT0 Black
2 WD20SPZX-22CRATO Blue
The Black drives are installed as files drives in my Windows 10 1803. The Blue are used as backups and are in removable caddies that go to the SATA6 system. All disks tested on the same motherboard SATA6 bus channel. Two were tested on different channels with no change in results.
The Black drives all are testing slower on all tests than the Blue by significant amounts. I then used True Image to write zeros across the disks then used Disk Management to format the drives (not checking the Quick format option). The results are the same. The Western Digital Dashboard tests all pass.
Is it correct to expect the Blacks to be Faster than the Blue drives?
Is CrystalDisk not working and/or is there a better/more trusted performance test utility?