The random write speeds is where I felt let down by the performance of the card. And remember, sequential tests are the best case scenario for any drive, so this is pretty much as good as it gets. The sequential read speeds were more or less in line with what CrystalDiskMark reported but the write speeds were much lower, around 45MB/s mark. To get a feel of the real world results, I transferred a large file to and from the card and timed the results manually. CrystalDiskMark reported about 68MB/s but it was quite an optimistic figure as the real world results were much lower. Even though it never quite reached the 100MB/s read speed in any test, a 93MB/s average wasn't too far off. Starting with the sequential tests, the SanDisk Ultra does reasonably well. I also ran AndroBench on each of the three smartphones to see how the numbers compared. The application used for testing the speed was CrystalDiskMark 6. Fortunately, it did, even in the humble Redmi 5, which had no issues working with it despite costing 1/3rd the price of the SD card.įor the performance tests, I used a Kingston MobileLite G4 USB 3.1 Gen 1 card reader on a Windows 10 PC. The last two were somewhat impractical, as no one will be buying such an expensive card for those two devices but it was worth checking if the card worked in them. To test for compatibility, I tried the card in three phones, a Samsung Galaxy S9+, a Nokia 7 Plus and the Xiaomi Redmi 5. If it wasn't the 400GB label, which makes most people do a double take, it looks pretty ordinary. The card itself looks identical to the smaller capacity models from the Ultra series. A full-size SD adapter is provided, though. You are essentially paying just for the storage here so don't expect much in terms of extras. For a $250 product, it comes in the same thin cardboard packaging as the lower capacity models.
In comparison, the Extreme series has a very clearly mentioned 160MB/s read and 90MB/s write speeds. Seriously, I even checked the website and SanDisk wouldn't commit to an exact figure anywhere. SanDisk advertises a 100MB/s speed for the card but reading closely reveals it is just the read speed, with the write speed not being mentioned anywhere.
Being part of their Ultra series, it's not as fast as the Extreme series of cards. The 400GB model we have today is the cheaper of the two offered by SanDisk. Although large capacity microSD cards are not particularly new, 400GB is still a mind-boggling amount of memory for something that is smaller than my thumbnail.
We usually don't review storage devices here but when SanDisk reached out to us to review their 400GB Ultra microSD, it was hard to say no.
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