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In this case, you may want to pay attention to your drive’s random read and write speed. However, many tasks involve reading and writing a bunch of smaller files stored in separate, random blocks of data across your drive.

This tends to be more significant when attempting to read and write big files, such as 4K video. Sequential speeds measure how fast it takes for the drive to read and write data blocks in a fixed order. You might know that file structures are essentially a bunch of blocks of data that are connected. The read and write speeds that manufacturers often measure is sequential speed. Inputs & Outputs Per Secondīefore you decide to purchase an SSD with the fastest advertised read and write speeds available, you should know that these aren’t necessarily the most important indicators of drive speed. The faster your read speed, the shorter it will take to copy.

If these files are huge, you’ll see a timer indicating how long the transfer will take. You most frequently encounter “write speed” when you’re trying to copy a file from one location to the other. On the other hand, write speed measures how fast a file can be written onto the drive.