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Review: Lexar LRWM04U-7000 UHS-II SD Card Reader USB 3.0

Lexar LRWM04U-7000 UHS-II SD Card Reader


The Lexar LRWM04U-7000 Secure Digital card reader is bundled with Lexar Professional 2000x UHS-II cards. It is not currently available for sale separately. The card reader features a compact design and supports UHS-II, UHS-I and standard SD cards. The reader is compatible with USB 3.0 and 2.0.

The case is made of textured plastic with a high-gloss accent along the outer edge. It feels relatively light but is still solid enough to provide an impression of durability. SD cards insert into the end of the reader to a depth of about one inch (25mm), leaving about 1/4 inch (6mm) protruding outside. The slot has a very close fit and holds cards securely. There is no card access light.

The reader is about 3/8 inches (10mm) thick and just over 1-1/4 inches (33mm) wide, and 2-1/4 (57mm) total length including the USB connector. It is just slightly larger than the Kingston MobileLite G4 UHS-II card reader.


Since this is a "free" card reader one might not expect the best performance, but this diminutive device provided some of the highest transfer speeds among all readers.

Reader: Lexar LRWM04U-7000 UHS-II 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 LRWM04U-7000 UHS-II Reader
Card Benchmarks
Transcend Ultimate UHS-II U3 64GB298.272180.540
Lexar Professional 2000x UHS-II 32GB296.501272.570
Transcend Ultimate UHS-II U3 32GB296.333181.697
Lexar Professional 2000x UHS-II 64GB292.245265.765
SanDisk Extreme Pro 280MB/s UHS-II 32GB274.496226.891
Panasonic MicroP2 UHS-II 32GB272.39349.700
Lexar Professional 1800x microSD UHS-II 32GB272.322222.227
Delkin 1900x UHS-II 32GB271.02051.040
Sony M Series UHS-II 64GB266.91598.960
SanDisk Extreme Pro UHS-II 275MB/s microSDXC 64GB264.859106.239
Toshiba Exceria Pro UHS-II 32GB260.548235.635
Lexar Professional 1000x UHS-II 32GB154.02186.530
Lexar Professional 1000x UHS-II 64GB153.14482.396
Lexar Professional 1000x UHS-II 128GB151.90186.431
Lexar Professional 1000x microSD UHS-II 32GB151.63852.743
SanDisk Extreme Plus 80MB/s microSD 32GB99.57065.454
SanDisk Extreme Pro 95MB/s 64GB99.57092.369
SanDisk Extreme Pro 95MB/s 32GB99.56192.786
SanDisk Extreme Plus 95/90 MB/s microSD 64GB99.55291.316
SanDisk Extreme Pro 95MB/s microSDHC 32GB99.55290.935
SanDisk Extreme Pro 95MB/s microSDXC 64GB99.55291.252
SanDisk Extreme 90MB/s U3 64GB99.55249.513
SanDisk Extreme Pro 95MB/s 128GB99.55291.173
SanDisk Extreme 90MB/s U3 32GB99.55249.130
SanDisk Extreme 90MB/s microSDHC 32GB99.54248.965
SanDisk Extreme Pro 95MB/s U3 32GB99.54291.316
SanDisk Extreme Plus 95/90 MB/s microSD 32GB99.54290.387
SanDisk Extreme 90MB/s U3 V30 microSDXC 128GB99.53364.004
SanDisk Ultra 80MB/s microSD 64GB99.52320.791
SanDisk Extreme Pro 95MB/s 256GB99.50490.293
SanDisk Extreme 90MB/s U3 V30 256GB99.45764.540
SanDisk Extreme Plus 80MB/s 32GB99.45761.191
SanDisk Ultra 80MB/s microSD 128GB99.44853.685
Kingston U3 90/80 MB/s 32GB98.54190.872
Kingston Class 10 UHS-I 64GB98.53271.230
Kingston U3 90/80 MB/s 64GB98.53285.801
PNY Pro Elite microSDXC 64GB98.52387.644
Panasonic Gold 95/90 64GB98.52385.528
Kingston U3 (90/80) microSD 64GB98.52383.339
Patriot EP Series microSDXC 64GB98.51383.029
Samsung EVO Select microSDXC 256GB98.43987.784
Patriot EP PRO microSDXC 64GB98.39386.860
SanDisk Extreme Plus 80MB/s 64GB98.32960.907
PNY Pro Elite 64GB98.18186.545
Toshiba Exceria Type 2 32GB98.08965.471
Toshiba Exceria Type 1 32GB98.08088.027
Toshiba Exceria UHS-I Class 3 32GB98.08061.052
Toshiba Exceria UHS-I Class 3 64GB98.08059.833
Samsung PRO Plus 64GB97.89788.915
Samsung PRO U3 32GB97.89779.794
Samsung PRO Plus 32GB97.87087.505
Samsung PRO U3 64GB97.85179.138
Samsung PRO Select microSDXC 64GB97.85186.903
Samsung PRO microSDXC 64GB97.78879.204
Samsung PRO Plus microSDXC 64GB97.77888.027
Delkin Black 32GB97.67881.316
Delkin Elite 633x 32GB97.66981.894
Patriot EP Pro 90MB/s 32GB97.26147.752
Samsung EVO Select microSDXC 64GB97.06325.575
PNY Elite microSDXC 64GB96.90232.983
Lexar Professional 633x U1 64GB96.88428.645
Lexar Professional 633x U1 32GB96.86622.303
Lexar Professional 633x microSDXC 64GB96.85728.224
Transcend 95/60 MB/s U3 128GB96.76867.825
Transcend 95/60 MB/s U3 64GB96.76866.597
PNY Elite Performance U3 128GB96.75969.195
Transcend R95 W85 U3 64GB96.75988.316
Transcend 600x 64GB96.75967.203
PNY Turbo Performance microSDXC 64GB96.75059.055
PNY Elite Performance 64GB96.75066.424
Transcend 600x 128GB96.74155.197
PNY Elite Performance 90MB/s 32GB96.73238.374
Lexar Professional 633x U3 256GB96.73266.916
Transcend 633x microSDHC 32GB96.73285.984
PNY Elite microSDXC 128GB96.71427.995
PNY Turbo Performance U3 microSD 32GB96.71456.442
Transcend 95/85 MB/s U3 32GB96.71489.370
Transcend 600x 32GB96.70539.158
PNY Elite-X microSDXC 64GB96.70574.288
PNY Elite Performance U3 256GB96.70555.290
Lexar Professional 633x U1 128GB96.70528.636
Gobe Magic 104MB/s 32GB96.67987.535
Sony 95MB/s U3 32GB96.67988.331
Sony 95MB/s U3 64GB96.67987.345
Gobe Magic 104MB/s 64GB96.67086.968
Sony 94MB/s 32GB96.67066.933
PNY Elite-X microSDHC 32GB96.66176.723
Transcend Ultimate 633x microSD 64GB96.64387.077
Lexar Professional 600x 64GB96.62567.860
Lexar Professional 600x 32GB96.59048.550
Panasonic Gold Series 32GB96.42143.471
Patriot EP Pro 128GB96.39442.518
SanDisk Extreme Plus 90MB/s 32GB96.22671.825
Patriot EP Pro 90MB/s 64GB96.18241.462
Lexar Professional 633x U3 32GB96.10348.429
Lexar Professional 633x U3 64GB96.01568.926
Samsung PRO 32GB95.96282.767
Samsung PRO 64GB95.90082.409
Lexar Professional 633x U3 128GB95.53468.552
Kingston Ultimate 32GB95.46446.893
Samsung PRO Plus microSDXC 128GB94.93784.101
Samsung PRO Select microSDXC 128GB94.91184.209
SanDisk Extreme Plus 90MB/s 64GB94.13671.766
SanDisk Extreme 90MB/s microSDXC 64GB92.54943.654
SanDisk Ultra 90MB/s microSD 200GB90.77821.035
Lexar Professional 633x microSDXC 200GB90.68436.880
Samsung EVO Select microSDXC 128GB88.18217.534
SanDisk Extreme 80MB/s 128GB85.15380.203
SanDisk Extreme 90MB/s U3 128GB85.13278.293
Lexar Professional 633x microSDXC 128GB84.18222.299
Samsung EVO Plus 128GB microSDXC84.08821.752
SanDisk Ultra 80MB/s microSD 32GB82.58517.556
SanDisk Extreme 80MB/s 256GB81.51278.911
SanDisk Extreme 60MB/s 32GB75.61755.211
SanDisk Extreme U3 microSD 32GB74.83954.162
Lexar Professional 400x 32GB71.46843.443
SanDisk Extreme 60MB/s 64GB71.29352.437
SanDisk Extreme U3 microSD 64GB69.68256.014
SanDisk Ultra 40MB/s 64GB47.75415.648
SanDisk Ultra 40MB/s 32GB Card 147.75445.025
SanDisk Ultra microSD 64GB47.75415.184
SanDisk Extreme 45MB/s 32GB47.75244.907
SanDisk Ultra microSD 32GB47.75214.656
Samsung EVO 64GB47.68623.623
Samsung EVO microSDXC 64GB47.68623.574
Samsung EVO microSD 32GB47.64124.463
SanDisk Ultra 40MB/s 32GB Card 347.39819.670
SanDisk Ultra 40MB/s 32GB Card 247.39319.914
Samsung EVO 32GB47.35921.992
Toshiba NFC 16GB37.88313.105
Toshiba FlashAir II 32GB19.10312.980