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Review: Lexar Professional Dual Slot Reader USB 3.0

Lexar Professional Workflow Dual Slot Card Reader

Note: An updated version of this reader has replaced this reader. See the Lexar Professional Dual Slot UHS-II Card Reader LRW400U review.


The Lexar Professional Dual-Slot Reader provides a convenient way to read CF and SD cards and has a unique pop-up design to protect the slots when not in use. The latest version of this reader supports CompactFlash cards with UDMA 7. A firmware update is available to update earlier versions of this reader. The Secure Digital slot supports SD/SDHC/SDXC cards including UHS-I.

Bright blue LED turns on when a card is inserted and flashes when a card is being accessed. The CF card slot offers a firm and positive feel, with little play. The CF card inserts to about 3/4-inch (19mm) depth which should eliminate any concern of bent pins. The SD card slot is about 5/8-inch (16mm) deep and has a similar precise feel. Both cards protrude the same amount and with only 3/32-inch (2.5mm) between them grasping the smaller SD card can be difficult when a CF card is inserted.

Lexar Professional Dual Slot Card Reader

The clear plastic outer case protects the reader. When tabs on the sides are pressed the reader pops up to reveal the SD and CompactFlash slots. The spring is firm enough to hold the card reader in the open position and the tabs only require a gentle touch to open. The tabs are recessed enough to prevent accidental opening when the reader is loose in a camera or accessory bag with other items. Closing the reader requires firm push, it locks shut with a positive click.

Lexar Professional Workflow Dual Slot Card Reader Bottom

The high-gloss black top is attractive but tends to show fingerprints, dust and scratches. A white rubber pad on the bottom helps hold the Dual Slot reader in place. Overall the Lexar Dual-Slot Reader feels solid and durable. A micro USB 3 connector is located on the back of the reader.


The Lexar Dual-Slot Reader posted some very fast read and write speeds using both CompactFlash and Secure Digital cards. The fastest read speeds using CF cards were only slightly below those seen in the Lexar Professional Workflow CFR1, the fastest CF reader tested to date. The Dual Slot topped out at 156.8 MB/s using a Lexar 1066x 32GB CF card. SD card speed was excellent, for both reading and writing.

Reader: Lexar Professional Dual Slot Reader
Benchmark: CrystalDiskMark 3.0.3 x64
Program settings: 1000 MB, 5 passes, random test data
Operating system: Windows 10 Pro
Motherboard: Gigabyte GA-Z77X-UD3H
Processor: Intel Core i7-3770K @ 4.40GHz
RAM: 32GB DDR3 1600

Lexar Professional Dual Slot Reader
Card Benchmarks
Lexar Professional 1066x 64GBCF157.491139.013
Lexar Professional 800x 64GBCF157.20875.770
Lexar Professional 1066x 32GBCF156.832139.161
SanDisk Extreme Pro 160MB/s 32GBCF156.247135.580
Lexar Professional 1066x 128GBCF155.737136.711
Transcend 1000x 32GBCF154.112133.237
Lexar Professional 800x 32GBCF153.95345.696
Toshiba Exceria Pro 1066x 32GBCF153.818135.091
Toshiba Exceria 1000x 32GBCF153.593106.747
PixelFlash SuperSport 1000X-PRO 128GBCF153.278129.151
Transcend 1000x 128GBCF153.189133.986
SanDisk Extreme Pro 160MB/s 256GBCF152.720135.896
SanDisk Extreme Pro 160MB/s 64GBCF152.498132.899
Komputerbay 1066x 128GBCF152.365134.778
Toshiba Exceria 1000x 64GBCF151.244118.016
Toshiba Exceria Pro 1066x 64GBCF146.184132.329
Kingston Ultimate 600x 32GBCF125.925112.327
SanDisk Extreme 120MB/s 32GBCF117.71268.418
SanDisk Extreme Pro 95MB/s 32GBSD97.35291.363
SanDisk Extreme Pro 95MB/s 64GBSD97.34393.240
SanDisk Extreme Plus 80MB/s microSD 32GBmicroSD97.26165.659
SanDisk Extreme 90MB/s U3 32GBSD97.15349.278
SanDisk Extreme Plus 80MB/s 32GBSD96.75060.405
SanDisk Extreme 90MB/s U3 64GBSD96.69649.686
Toshiba Exceria Type 2 32GBSD96.60765.791
SanDisk Extreme Pro 95MB/s 128GBSD96.60792.191
Toshiba Exceria Type 1 32GBSD96.59888.428
SanDisk Extreme Pro 95MB/s microSDHC 32GBmicroSD96.57292.369
SanDisk Extreme Plus 95/90 MB/s microSD 64GBmicroSD96.53692.150
Kingston U3 90/80 MB/s 32GBSD96.48391.427
Kingston Class 10 UHS-I 64GBSD96.46571.405
Kingston U3 90/80 MB/s 64GBSD96.45686.831
SanDisk Extreme Pro 95MB/s microSDXC 64GBmicroSD96.43992.418
SanDisk Extreme Plus 95/90 MB/s microSD 32GBmicroSD96.27091.763
Toshiba Exceria Pro UHS-II 32GBSD96.23592.045
Toshiba Exceria UHS-I Class 3 32GBSD95.92761.594
Panasonic Gold 95/90 64GBSD95.78787.600
Toshiba Exceria UHS-I Class 3 64GBSD95.78760.957
Samsung PRO Plus 64GBSD95.56888.795
Delkin 1900x UHS-II 32GBSD95.50750.299
Transcend 95/60 MB/s U3 64GBSD95.47367.186
Transcend R95 W85 U3 64GBSD95.44789.929
Lexar Professional 1800x microSD UHS-II 32GBmicroSD95.42177.357
Transcend 95/85 MB/s U3 32GBSD95.40389.745
PNY Elite Performance U1 64GBSD95.36067.333
PNY Elite Performance U1 32GBSD95.36038.498
Transcend 600x 32GBSD95.35139.267
Samsung PRO Plus 32GBSD95.31689.279
Sony 94MB/s 32GBSD95.30867.083
Sony 95MB/s U3 32GBSD95.26489.021
Sony 95MB/s U3 64GBSD95.23088.145
Patriot EP Pro 128GBSD95.23042.741
Patriot EP Pro 90MB/s 64GBSD95.19541.940
PNY Turbo Performance U3 microSD 32GBmicroSD94.88557.665
Transcend 633x microSDHC 32GBmicroSD94.84289.446
Lexar Professional 600x 64GBSD94.80868.570
Transcend 600x 64GBSD94.79967.737
Patriot EP Pro 90MB/s 32GBSD94.78247.839
Transcend 95/60 MB/s U3 128GBSD94.75768.440
PNY Elite Performance U3 128GBSD94.70568.981
Lexar Professional 2000x UHS-II 32GBSD94.62093.958
SanDisk Extreme Plus 80MB/s 64GBSD94.55160.667
Gobe Magic 104MB/s 64GBSD94.50089.203
Gobe Magic 104MB/s 32GBSD94.43289.006
Lexar Professional 600x 32GBSD94.38148.561
Lexar Professional 2000x UHS-II 64GBSD94.19593.331
Lexar Professional 633x U3 64GBSD93.90869.327
Panasonic Gold Series 32GBSD93.76543.428
Lexar Professional 633x U3 32GBSD93.67348.928
Samsung PRO 32GBSD93.61483.286
Kingston Ultimate 32GBSD93.57347.038
Lexar Professional 1000x UHS-II 32GBSD93.55677.540
Samsung PRO 64GBSD93.53183.056
Lexar Professional 1000x UHS-II 128GBSD92.86876.824
Transcend Ultimate UHS-II U3 64GBSD92.85291.157
Lexar Professional 1000x UHS-II 64GBSD92.68876.138
Lexar Professional 633x U3 128GBSD92.65568.548
Transcend Ultimate UHS-II U3 32GBSD92.65590.645
SanDisk Extreme 90MB/s U3 128GBSD85.18878.574
SanDisk Extreme 80MB/s 128GBSD84.73380.154
Delkin Elite 633x 32GBSD84.19678.258
Delkin Black 32GBSD84.14277.978
SanDisk Ultra 80MB/s microSD 32GBmicroSD82.57217.819
SanDisk Extreme 80MB/s 256GBSD82.08779.132
SanDisk Extreme 60MB/s 32GBSD75.45955.020
SanDisk Extreme U3 microSD 32GBmicroSD74.56854.280
Lexar Professional 400x 32GBSD72.31143.731
SanDisk Extreme 60MB/s 64GBSD71.04752.674
SanDisk Extreme U3 microSD 64GBmicroSD69.46155.897
SanDisk Ultra 50MB/s 32GBCF50.88930.379
SanDisk Extreme Pro 280MB/s UHS-II 32GBSD47.81946.067
Panasonic MicroP2 UHS-II 32GBSD47.75837.571
SanDisk Ultra microSD 64GBmicroSD47.53914.583
SanDisk Ultra 40MB/s 64GBSD47.53714.906
SanDisk Ultra microSD 32GBmicroSD47.53714.640
SanDisk Ultra 40MB/s 32GB Card 1SD47.53145.642
SanDisk Extreme 45MB/s 32GBSD47.51645.495
Samsung EVO 64GBSD47.34823.816
SanDisk Ultra 40MB/s 32GB Card 3SD47.34219.822
Samsung EVO 32GBSD47.31829.806
SanDisk Ultra 40MB/s 32GB Card 2SD47.24820.001
Samsung EVO microSD 32GBmicroSD47.21024.732
Toshiba NFC 16GBSD37.45613.159
Toshiba FlashAir II 32GBSD19.00612.967

Compatibility is listed as Mac OS X 10.5+ and Windows 7/Vista/XP. The Lexar Professional Dual-Slot Reader is covered by a five-year limited warranty. Made in China.

Note: This reader has been replaced by the Lexar Professional Dual Slot UHS-II Card Reader.

Compare prices on the Lexar Professional Dual Slot Reader reader. The lowest prices are highlighted in the table below.

Card ReaderConnectionModel NumberPrices
AmazonB&H PhotoAdorama
Lexar Professional Dual Slot ReaderUSB 3.0LRW307URBNA$59.00Check priceCheck price