SANDISK MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN

Problem: PCs these days don't usually have MicroSD readers and I needed one because I own phones and tablets. When I want to transfer gigs of pictures/videos to my PC this card reader does that easily and quickly. Speed: I bought this because its USB 3.0 which means I should get 500MB/s. When used with a C10 or U1 MicroSD that only does 100MB/s the card itself is the bottleneck. Even a U3 is 300MB/s peak transfer and a high quality V## MicroSD are the exact same UHS2 300MB/s speeds and means this device is somewhat futureproof for a while. Capacity: ZERO! On the user. I bought a 256GB U3 MicroSD card for less than 20$ to leave in it. Intended use vs actual use: Wanted it so I could transfer files easily but that's not that often. Practical use, I installed CallOfDuty and its 200+GB on the card and run my game off the chip now. I feel like it loads MW3 faster and is a bit smoother. Less than 30$ I kinda unintentionally got a setup that helped my gaming by freeing up space and improving my performance while still allowing me to transfer files from portable devices when I need to. Perfect for what it does and I'd buy another one if I ever need to. Parts are durable and its compact so I doubt it will break since there's nothing really to break. It's nice solid hardware and a great value for the price.

So excited this worked! I was worried it wasn't going to. Just make sure you're using a USB 3.0 port (usually will be blue on the inside). A little concerning, and I will update my review if it causes any issues, but the reader got quite warm during an only 13.4GB upload to my computer. Edit: After performing a much larger upload of 134GB, the performance did degrade as the card reader warmed up. However, it would return to ~170Mb/s after cooling down a bit.

Working great for me. A must have. Compact and a good value for reading memory cards.

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.

I bought the SanDisk MobileMate USB 3.0 microSD Card Reader to use with a 256GB SanDisk High Endurance microSD card in my Tesla Model S — and it works perfectly! The Tesla instantly recognizes the reader when it's plugged into the front USB port, and both Dashcam and Sentry Mode start recording automatically. No setup hassle, no errors — just simple plug-and-play. The build quality is solid, and transfer speeds are excellent when moving video files to a computer. It’s compact enough to fit neatly in the center console without getting in the way, and it doesn’t overheat even after hours of continuous use. If you're setting up Dashcam or Sentry Mode on your Tesla and prefer using a microSD card setup (which is more reliable than USB flash drives), this reader is exactly what you need. Super reliable, fast, and affordable. Highly recommended!

This item worked perfectly and I just the model three to read my microSD card for a video recording. Definitely recommend!

Sandisk, quality memory chips.

This device may as well be dead on arrival. I couldn't figure out why my computer did not recognize that I had it plugged in. You have to push it in so tightly you feel like you are going to break the card or something else. It only has erratic acceptance of the card and so sometimes your computer will recognize you have it plugged in and sometimes it won't. Not reliable at all. Sorry guys.

Un producto increíble al lado de las tarjetas micro SD, mucho más práctico y confiable sin batallar en que se detecte.

kaliteli , küçük, kullanışlı

Loving this tiny little USB 3 SanDisk Micro SD card reader. Built well & seems as tough as can be expected while remaining so small. I have no clue regards a good few negative reviews that have been left for this item... I'm thinking that the negative reviews users should have bought a far bigger Reader as moaning about its size as a bad point defeats the purpose of the item as it's obviously supposed to be small which surprise surprise it is. Other negative feedback comments claimed cards were hard to get back out once inserted & again it's size related as in of course it's going to be figity & a little effort is required to get a tiny micro sd back out once inserted into this tiny low profile reader. The thing does exactly what it's designed to do & that's read / write to Micro SD cards at full USB 3 speeds. It's exactly what I wanted as I am using it in my Car's USB HiF input loaded up with Flac files & needed something very small & low profile that I could plug in, use & basically forget about it knowing it won't get in the way by being big & sticking out etc... It reads & writes as quickly as full sized SD card USB 3 readers do but since it is so small if you're needing a reader for heavy use then I suggest you buy a larger sized 1. Summing up = Great Little USB 3 Micro SD Card reader & Ideal for users requiring something with a Low profile or / & require it for a tight space ;) Highly Recommended :)

OK

​Compré este adaptador SanDisk para transferir archivos y funciona de maravilla. Es extremadamente compacto, lo que facilita llevarlo a cualquier lado, y la construcción se siente sólida y duradera. La velocidad de transferencia es consistente y es totalmente "Plug & Play": lo conectas y el equipo lo reconoce al instante sin instalar nada. ​Pros: ​Diseño minimalista: No bloquea otros puertos USB cercanos. ​Velocidad: Aprovecha bien la categoría de la tarjeta micro SD. ​Fiabilidad: No se calienta en exceso ni se desconecta durante el uso. ​Contras: ​Al ser tan pequeño, es fácil perderlo si no se tiene cuidado (recomiendo usar un cordón). ​Veredicto: Una solución perfecta y económica si tu laptop no tiene ranura para tarjetas. Muy recomendado.