Samsung EVO 128GB MicroSD and Linux

đź“… July 29, 2016
evo128_frontWhat? Is a 200GB MicroSD card too much storage space?

The 128GB capacity cards are plentiful, and one good card worth considering is the Samsung EVO 128GB microsd. It is compatible with Linux, it offers decent read and write speeds, and it features the quality we expect from Samsung.


The typical packaging you would expect. Includes the microsd card and one microsd-to-SD adapter.


Samsung EVO microsd package for the 128GB version. Other capacities are available in the EVO line.


Back of the package. Sports the typical disclaimers (1G = 1,000,000,000 bytes, etc.) and touts a 10-year warranty.

The Card Itself

This is a UHS-1 Class 10 card. I tested the card in Linux Mint 17.3 using the Disks benchmark, and here is the result:


Linux Mint 17.3 Disks. ext4 formatting. Using a USB 3.0 card reader connected via a USB 3.0 port. 32.9MB/s reads and 8.3 MB/s write.

The front of the package claimed “up to 48 MB/s transfer speed with UHS-1,” but cards rarely meet their advertised claims. That is why we see so many asterisks “*” on the packaging. This card is no exception. Despite repeating the benchmarks, the 32/8 MB/s read/write speeds were consistent in Linux Mint 17.3. This is actually fine for everyday usage, but it still feels disappointing when the package text makes claims that lead me to believe in better results. On the bright side, the read/write results seen in the graph were consistent, unlike the SanDisk 200G card that began with fast write results but then dropped to slower write speeds over time.

By contrast, CrystalDiskMark 5.1.2 (Windows 7) reported better results closer to the advertised 48 MB/s speed (sequential, of course):


CrystalDiskMark 5.1.2. FAT32 formatted. ~46 MB/s reads, ~25 MB/s writes. Using the same USB 3.0 adapter as before.

In this case, the packaging is closer to the truth, which must mean a difference in benchmarks. Not certain why those differences exist, but this is still a good card that retains data well. I have not encountered any corrupted files — providing that the card was also safely ejected from the system first.


Linux Mint 17.3 Disks recognizes the microsd card perfectly. No drivers required. Here, it was reformatted to ext4. Even though we see a raw capacity of 128G, formatted capacity will be 7% less: ~119 GB usable space.

Will the Samsung EVO 128G Work with the PlayStation Portable?


Connecting the 128G microsd to the PSP using a MicroSD-to-Memory Stick adapter is possible, but the PSP will not use the card. The PSP will recognize the card and format it, but if you try to then connect the card to a computer in order to transfer files, you will be prompted with this dialog in Linux Mint 17.3:


Linux Mint 17.3 attempting to read the PSP-formatted Samsung EVO 128G microsd.

Formatting the card in Linux and then inserting it into the PSP does not work either. This is the same situation when testing the PSP with the SanDisk 200G microsd. Apparently, the PSP is not compatible with 128+ GB cards, and this is strange because two 64G microsd cards in a dual adapter work perfectly by giving the PSP 128G of unformatted storage space (119GB after formatting).


This is another good microsd card for everyday use. As long as you do not need fast, 80+ MB/s write speeds, then this should fill the need at an average cost for its capacity. So far, this card is reliable, compatible with a wide range of devices when formatted as FAT32, and, best of all, compatible with Linux.

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