Random Read and Write tests are as important, if not more so, as many SSDs can deliver fast maximum continuous read and writes but much less so for random small data blocks. This is useful but only measures one aspect of an SSD, and doesn't necessarily mimic accurately how most disk interactions occur. So why am I always complaining about BlackMagic Disk Speed TestīlackMagic's Disk Speed Test only tests one thing, continuous throughput. While it isn't a direct port, it's heavily inspired by the famed and loved Windows utility, CrystalDiskMark. The first commenter on FaceBook pointed out that we finally have a good disk benchmark utility AmorphousDiskMark. R switch would do the same job after all (Disk Surface Check).Awhile back, I made a video about USBc and the classic Mac Pro but lamented yet ago the terrible benchmarking on macOS. When the log is filled, old entries are removed.
The drive's self-test log can contain up to 21 read-only entries. It is possible for the long test to pass even if the short test fails. > The self-test logs for SCSI and ATA drives are slightly different. Selective Some drives allow selective self-tests of just a part of the surface. Only available on ATA drives, and it usually takes several minutes. This test usually takes several hours, depending on the read/write speed of the drive and its size.Ĭonveyance Intended as a quick test to identify damage incurred during transporting of the device from the drive manufacturer to the computer manufacturer. Long/extended A longer and more thorough version of the short self-test, scanning the entire disk surface with no time limit. Checks the list of pending sectors that may have read errors, and it usually takes under two minutes. Scans small parts of the drive's surface (area is vendor-specific and there is a time limit on the test). Mechanical test includes seeking and servo on data tracks. Electrical tests might include a test of buffer RAM, a read/write circuitry test, or a test of the read/write head elements. Short Checks the electrical and mechanical performance as well as the read performance of the disk. SMART drives may offer a number of self-tests: Ok, this is from th WIKI regarding SMART Tests:
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