The initial test file written by Diskspd contains completely unique data.Unfortunately diskspd itself is not a good tool for testing storage that supports de-duplication - see my separate post on Diskspd for the full details, but in short : DiskspdĪccording to their website, CrystalDiskMark is basically just a front-end to Microsoft Diskspd. Benchmarking software will basically show you just how well your hard drive or SSD performs at quickly retrieving data from random locations.CrystalDiskMark is the type of tool I wouldn't even normally look at due to it's focus market, but one of our SE's asked about it last week, so.ĬrystalDiskMark is a tool you would normally see used on standalone hard disks/SSD, in particular on consumer focused websites like Toms Hardware - not on enterprise All-Flash Arrays. Also measured in megabytes per second, benchmarking software will show you how quick and effective the storage device is at saving pieces of information at random locations on the disc.Īs you can imagine, 4K random read is similar, only that it benchmarks how effective reading data from random locations on the hard drive or SSD. As far as 4K random write goes, this is another disc access pattern where 4K blocks of data are written to - you guessed it - random locations of the hard or SSD. 4K Random Read and WriteĪnother test you’ll find on benchmarking software is 4K (an Advanced Format, see definition here) random read and write. This is also measured in megabytes per second. This disk access pattern is similar to that of sequential read, except that it happens when you’re writing (installing) large files to the drive, such as videos, music, photos, etc.
a process that happens when you’re installing software). Sequential write speeds are another disk access pattern used to write blocks of data to a location on the hard drive or SSD (e.g. It’s usually measured in megabytes per second in benchmarking software. Sequential read is essentially a disk access pattern where the user is accessing a large chunk of data (e.g. It will test the sequential read and write speeds of the hard drive. One of the tests will be a sequential test.
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