Crucial BX500 240GB SSD review

Posted 13 December 2018 13:19 CET by Antonis Sapanidis


I/O Performance

There is little point of having an SSD drive that has blazing sustained reading and writing speeds, if the drive can’t handle reading and writing of small random files. If you intend to use your new SSD drive to store and run your operating system, then the drive must be able to cope with the many small random files that Windows will write to the drive continually. So I feel it is very important to test how many of these random files that a drive can handle in one second. I believe that anything over 1,000 I/O’s per second would be enough for most users running a consumer grade mainstream PC, and should provide a smooth running system. But obviously, the more I/O’s that a drive can handle, the faster the drive will feel and leave more headroom for those huge multitasking sessions that users sometimes engage in.

The things that I will look at are the total I/O per second and total MB/s.

Partition alignment and sector boundaries

Windows 10 will automatically align a partition to 4k boundaries during partition creation, Windows XP won’t. It is imperative that an SSDs partition is aligned. Windows XP is also restricted to sector boundaries, while Windows 10 will use 4k boundaries if it can. The Crucial BX500 SSD is 4k boundary aware, and will use these boundaries if possible. Of course it will also remap LBAs for compatibility with the sector boundaries so that the drive can be used with Windows XP.

IOMeter allows us to set the sector boundaries for conducting the tests, and I have therefore set the sector boundaries at 4K, which means the IOMeter tests are valid for Windows 10 and Windows Vista users. XP users will not be able to obtain such results.

I will provide a screenshot of the tests on the review drive for those of you who like to see the actual test result. All the comparison drive results are represented in the form of graphs.

If any of you would like to see a screenshot from any IOMeter test on a particular drive, please feel free to request one, and I’ll post the screenshot in the forum thread.

All the IOMeter tests create a 20GB data set on the target drive, and each test is run for a duration of 3 minutes.



IOMeter 4K random write test with repeating data.

The first test involves creating continual 4KB random files on the target drive with IOMeter. I use a 4KB file size, as it is believed that Windows will create and modify many of this size of file constantly in the background during a typical Windows session.

Queue depth 1

Crucial BX500 SSD (Queue depth 1)

The result is not good.

Queue depth 4

Crucial BX500 SSD (Queue depth 4)

Again the Crucial BX500 gives a result that is not very good.

Queue depth 32

Crucial BX500 SSD (Queue depth 32)

Once again the performance of the Crucial BX500 SSD in this test is poor.



IOMeter 4K random read test.

If there are many 4k files created, then that must also mean that many 4k files need to be read. This test measures 4k writing performance.

Queue depth 1

Crucial BX500 SSD (Queue depth 1)

The result is good for a 240GB SSD but once again in general it’s not that impressive.

Queue depth 4

Crucial BX500 SSD (Queue depth 4)

The result here is again unimpressive.

Queue depth 32

Crucial BX500 SSD (Queue depth 32)

As queue depth goes up the there isn’t any improvement in performance.



IOMeter 512KB write test with repeating data.

Sequential writing performance is also very important, and in this test I will be measuring the sequential writing performance of the drive.

Crucial BX500 SSD – 512K Sequential write with repeating data

The Crucial BX500 SSD achieves only 259.44MB/Sec.



IOMeter 512KB read test.

This test measures 512k sequential reading performance.

Crucial BX500 SSD – 512K sequential reading test

The read test result is again unimpressive.



IOMeter Workstation simulation (outstanding I/Os = 64).

When running applications you will find that there is a mixture of small random files and larger sequential files, being created and read. Not only that, it isn’t just one file at a time. In this test I measure a simulated workstation pattern, with a queue depth of 64 (threaded).

Crucial BX500 SSD – Workstation simulation

On the workstation test the Crucial BX500 SSD gave the worst result that I have seen so far from an SATA SSD.


The Crucial BX500 SSD showed an impressive performance on almost all the IOMeter tests.

Let’s head to the next page for our power consumption test results…..