Customer Review

Reviewed in the United States on April 23, 2019
First off, it is very difficult to remove the microSD card from the reader if you have short nails. I would recommend putting a piece of (gaffer) tape on the card before inserting, to help with card removal.

I am doing an informal test of this reader using a "SanDisk 128GB Extreme microSD UHS-I Card with Adapter - U3 A2 - SDSQXA1-128G-GN6MA" card.

I compared this reader with a microSD to SD adapter in a "Lexar Professional USB 3.0 Dual-Slot Reader - LRW400CRBNA".

Per H2testw, the Lexar combo achieved 88 MB/s read and 81 MB/s write, and the Sandisk reader achieved 152 MB/s read and 75 MB/s write. This is writing and reading 1.0 GB test files to the card.

In Crystalmark, the Lexar combo achieved 94 MB/s sequential read and 83 MB/s sequential write, which Sandisk reader achieved 168 MB/s sequential read and 100 MB/s sequential write. If you look at the rest of the tests (random read/write), the Lexar combo is about 50% faster.

Overall, for larger files, this reader is roughly 40% faster than using a microSD to SD adapter and regular SD card reader. To copy the contents of a 128GB card (that is advertised to work with it), that means cutting the time from 23 minutes to 13 minutes. However, it does not appear to perform well in other use cases (unverified).

Another disadvantage: This USB reader does not fit in the same footprint as a SD card, so it does not store well in my memory wallet. Plus, it does not act as a 'backup' SD card.

My intent was to bring this item on travels to quickly unload files, however I think I would rather purchase more memory cards and leave this reader at home.

I am not sure if I would purchase this item again or would recommend it, however it does fit into my workflow of removing large files from the Sandisk microSD cards.
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4.0 out of 5 stars SanDisk MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN
By Ryan on April 23, 2019
First off, it is very difficult to remove the microSD card from the reader if you have short nails. I would recommend putting a piece of (gaffer) tape on the card before inserting, to help with card removal.

I am doing an informal test of this reader using a "SanDisk 128GB Extreme microSD UHS-I Card with Adapter - U3 A2 - SDSQXA1-128G-GN6MA" card.

I compared this reader with a microSD to SD adapter in a "Lexar Professional USB 3.0 Dual-Slot Reader - LRW400CRBNA".

Per H2testw, the Lexar combo achieved 88 MB/s read and 81 MB/s write, and the Sandisk reader achieved 152 MB/s read and 75 MB/s write. This is writing and reading 1.0 GB test files to the card.

In Crystalmark, the Lexar combo achieved 94 MB/s sequential read and 83 MB/s sequential write, which Sandisk reader achieved 168 MB/s sequential read and 100 MB/s sequential write. If you look at the rest of the tests (random read/write), the Lexar combo is about 50% faster.

Overall, for larger files, this reader is roughly 40% faster than using a microSD to SD adapter and regular SD card reader. To copy the contents of a 128GB card (that is advertised to work with it), that means cutting the time from 23 minutes to 13 minutes. However, it does not appear to perform well in other use cases (unverified).

Another disadvantage: This USB reader does not fit in the same footprint as a SD card, so it does not store well in my memory wallet. Plus, it does not act as a 'backup' SD card.

My intent was to bring this item on travels to quickly unload files, however I think I would rather purchase more memory cards and leave this reader at home.

I am not sure if I would purchase this item again or would recommend it, however it does fit into my workflow of removing large files from the Sandisk microSD cards.
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4.8 out of 5 stars
4.8 out of 5
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