# test > RouterOS command reference for /disk/test. ----------- ## disk/test **Conditions:** !smips **Type:** Command The test is initializing (preparing, clearing the caches) and has not started reading or writing yet. The test is running. The test failed. Disk or partition to test. Size of one read or write block. Default: 64 KiB. Number of parallel test threads. Default: 1. What the test does with the data. - `read` (default) - Read the disk; does not change its content. - `write` - Write to the disk; destroys all data on it. Test target: `device` reads or writes the raw block device, `filesystem` goes through the mounted file system. Default: device. Access pattern. - `sequential` (default) - Read or write consecutive blocks. - `random` - Read or write blocks at random positions. How many of the most recent result rows to keep and show. Sequence number of the result row; the `TOT` row aggregates all threads. Current throughput of this row. Input/output operations per second. Bytes transferred for this row so far. The tested disk. Thread this row belongs to; `TOT` aggregates all threads. Test type as given when the test was started. Access pattern as given when the test was started. Direction (`read` or `write`) as given when the test was started. Block size as given when the test was started. State of a running test, for example `clear caches` while it prepares and `run` while it works.