Doug Johnson Productions

Disk Performance

Using the DJ Drive Tool, we and others have tested and compiled real-world media performance data. Having this data makes buying decisions for your media needs easier.

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Lexar Professional 256GB 1667X SDXC UHS-II/U3

Card Type: SD Card
Capacity: 256.1 GB
Rated Speeds: Read 250 MB/sec, Write 120 MB/sec

Buy Now - Last Price $ 96.32, updated Fri, Jan 28, 2022


Max Average Std Dev Min 99% 95% 50% 5% 1%
Read Speeds 263.2247.65.6192.1259.3257.3246.5239.9237.7 MB/sec
Write Speeds 136.1129.24.5110.4135.7135.3130.1120.9120.0 MB/sec

Performance Chart

Test performed by Chuck McCollim of Pensacola, FL on a 'CalDigit TS3 Plus Thunderbolt 3 Dock' reader on Sunday, January 3, 2021 1:43 am UTC.

Tester note: Reader connected to Thunderbolt 3 port on MSI P75 Creator-469

What Do These Numbers Mean?

The Max, Min, and Average numbers represent the peak fastest, absolute slowest, and overall average performance across the entire drive when it was tested.

The percentage numbers indicate what percentage of the time the drive performed at the indicated level. So the 5% number means that 5% of the time, the drive performed slower than the number indicated, or conversely, that it performed faster 95% of the time.

We believe that the 5% numbers give the best marker as to the performance that you can expect from a drive.

How is this useful?

Manufacturers of SD, Compact Flash, CFast, and other media don't often advertise the write speeds of their cards. But in the video production world, sustained write speed is the most important metric. We need to know that cards are going to be able to write data as fast as our cameras and other recorders generate it.

Which Card Should I Get?

Short answer? Get a card as fast as your budget allows, as long as it is fast enough for your production workflow.

Longer answer? Get cards with write speeds in the above table higher than your recorder's required minimums.

Data rates vary quite a bit, based on the codec, resolution, frame rate, and even image quality of the camera. For example, at DJP we use the Hyperdeck Studio Mini from Blackmagic Design for most of our recording needs, and shoot in formats from 1080p24 up through 2160p30, usually in ProRes. Cards which are capable of writing at rates of 100MB/sec usually work well for this. Our cameras needs are more modest, where 40 MB/sec is plenty for 2160p30 in XAVC-S.

Submit a Card

Use the DJ Drive Tool to perform disk testing and submit card performance data to this site.

We recommend using the 'Refresh' mode to perform both read and write testing.