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. 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. What format of SD cards do you use? UHS-II is the second generation of SD cards released in 2013, which offers faster read/write speeds than the first generation. Most camera’s on the market use only UHS-I SD or MicroSD cards. But cameras with long buffer’s and fast continuous shooting speeds usually support these second-generation cards. Knowing which cards your camera uses, will help separate options, as some readers don’t support UHS-II cards. Alternatively, if they do, they only transfer at UHS-I speeds, defeating the whole purpose of buying them altogether. Read & Write Speed

Do you need only a single port? Or do you want multiple ports for more than one card? This will also be a factor in your decision-making process. If you have multiple devices, consider getting a reader or hub that supports all devices. Compare prices on the Lexar Professional Dual Slot UHS-II reader. The lowest prices are highlighted in the table below. 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. Introduction

Recognized for best-in-class capabilities as an ISV (Independent Software Vendor)

Updating USB 3.0 Dual-Slot Reader driver benefits include better hardware performance, enabling more hardware features, and increased general interoperability. Potential risks of installing the wrong Card Reader drivers include PC instability, slower performance, and random crashes.

The Lexar Dual-Slot Reader was tested with a variery of CompactFlash and Secure Digital cards. The Lexar Professional 2000x UHS-II 64GB SDXC measured 268MB/s sequential read speed and 250MB/s write speed. Using UDMA7 CompactFlash cards such as the Lexar Professional 1066x 128GB, the reader reached over 158MB/s read and 155MB/s write speeds. Results using various cards can be viewed in the table below. With UHS-II SD cards the Dual Slot LRW400U was not quite as fast as the Lexar SR2 UHS-II SD card reader. The CF card write speed improved over the previous Dual Slot reader, up from 139MB/s to over 155MB/s with the new reader.Opening up the reader is super simple – just push the two plastic pieces on the side and it comes right up. 3) Performance It's possible to associate Professional USB 3.0 Dual-Slot Reader errors with corrupt PC drivers. Drivers will work one day, and for a variety of reasons, suddenly quit working the next day. You don’t need to worry, because your Card Reader problem will definitely be repairable with an updated driver.