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Review: Lexar LRWM03U-7000 microSD UHS-I Card Reader USB 3.0

Lexar LRWM03U-7000 microSD UHS-I Card Reader


The Lexar LRWM03-7000 microSD card reader is included with Lexar Professional 633x UHS-I microSD cards. It is not sold separately. The card reader supports all microSD cards including standard SD and UHS-I. Although UHS-II cards can be used in the reader, it does not have the UHS-II interface and will operate at UHS-I speed only (the interface is limited to 104MB/s and below). The card reader supports USB 3.0 and is backwards compatible with USB 2.0.

The reader is made of white and blue textured plastic. It has a small hole that could be be an attachment point for a key chain. The reader measures 1 1/4 inches (32mm) in length by 11/16 inches (17mm) wide and 3/8 inches (9mm) tall, including the USB connector. When a microSD card is inserted in the reader it does not extend past the end of the reader. There is no card indicator light.

Lexar LRWM03U-7000 microSD UHS-I Card Reader back


Although this is a "free" card reader included with the purchase of Lexar UHS-I microSD cards, it provides decent performance. The highest read speed benchmark was 95.7 MB/s and sequential write speed reached 90.6 MB/s. This was marginally faster than the similar Lexar LRWM05U-7000 UHS-II microSD card reader when tested with UHS-I cards, although the UHS-II reader provides much higher performance when used with UHS-II cards.

Reader: Lexar LRWM03U-7000 UHS-I microSD Reader
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 8.1 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600

Lexar LRWM03U-7000 UHS-I microSD Reader
Card Benchmarks
SanDisk Extreme 90MB/s U3 V30 microSDXC 128GB95.77863.446
SanDisk Extreme Pro 95MB/s microSDHC 32GB95.70890.247
SanDisk Extreme 90MB/s microSDHC 32GB95.54248.624
SanDisk Extreme Pro 95MB/s microSDXC 64GB95.51690.637
SanDisk Extreme Plus 95/90 MB/s microSD 32GB95.43890.301
SanDisk Extreme Plus 80MB/s microSD 32GB95.11864.968
PNY Elite-X microSDHC 32GB95.02376.656
SanDisk Extreme Plus 95/90 MB/s microSD 64GB94.92890.441
SanDisk Extreme Pro UHS-II 275MB/s microSDXC 64GB94.67181.392
Patriot EP Series microSDXC 64GB94.62082.409
PNY Pro Elite microSDXC 64GB94.62086.882
Patriot EP PRO microSDXC 64GB94.60382.390
Lexar Professional 1800x microSD UHS-II 32GB94.57778.498
Lexar Professional 633x microSDXC 64GB94.56028.088
Kingston U3 (90/80) microSD 64GB94.55183.260
Transcend 633x microSDHC 32GB94.46687.105
PNY Elite-X microSDXC 64GB94.39071.327
PNY Elite microSDXC 64GB94.33032.451
PNY Elite microSDXC 128GB94.28828.421
Transcend Ultimate 633x microSD 64GB94.26287.425
PNY Turbo Performance microSDXC 64GB94.22056.116
Kingston U3 (90/80) microSD 32GB94.17839.787
PNY Turbo Performance U3 microSD 32GB94.09356.260
Samsung EVO Select microSDXC 64GB94.03425.126
Samsung EVO Select microSDXC 256GB94.01787.483
Samsung PRO Select microSDXC 64GB93.95087.725
Samsung PRO Plus microSDXC 64GB93.77487.843
Samsung PRO microSDXC 64GB93.73279.959
SanDisk Ultra 80MB/s microSD 64GB92.78620.903
Lexar Professional 1000x microSD UHS-II 32GB92.60651.705
SanDisk Ultra 80MB/s microSD 128GB92.57352.796
SanDisk Extreme 90MB/s microSDXC 64GB92.36942.923
Lexar Professional 633x microSDXC 200GB91.53137.366
Samsung PRO Plus microSDXC 128GB91.32383.853
Samsung PRO Select microSDXC 128GB91.23684.203
SanDisk Ultra 90MB/s microSD 200GB90.16120.969
Samsung EVO Plus 128GB microSDXC86.12521.331
Lexar Professional 633x microSDXC 128GB85.36122.120
SanDisk Ultra 80MB/s microSD 32GB82.89115.206
Samsung EVO Select microSDXC 128GB82.58522.227
SanDisk Extreme U3 microSD 32GB74.06253.790
SanDisk Extreme U3 microSD 64GB68.99455.477
SanDisk Ultra microSD 32GB47.67614.605
SanDisk Ultra microSD 64GB47.54615.703
Samsung EVO microSDXC 64GB47.48823.617
Samsung EVO microSD 32GB47.44924.568