The fastest read and write speeds were seen using the Toshiba Exceria Pro UHS-II card: 248.6 MB/s sequential read and 215.9 MB/s sequential write. We tested the reader using both UHS-I and UHS-II cards. UHS-II is capable of delivering amazing throughput, and the SanDisk Extreme Pro UHS-II reader does not disappoint.
Its size may cause interference with adjacent ports. The reader overhangs the USB plug by 11mm on each side, 1mm on the bottom and 8mm on the top. This makes it rather large for a compact card reader. The case measures 2.25 x 1.375 x 0.5 inches (57 x 35 x 13mm) not including the USB plug. On first use it does not instill much confidence, but it works reasonably well after understanding its operation. It requires very little force to lock or unlock, and latches into position when moved fully to either end. Depending on how the slider is pressed it may emit clicking noises or no sound at all. This makes extending the plug counter-intuitive because the ridge on the center of the slider means the opposite end will be used to push. It is unlocked by pressing down on the end of the slider button toward the USB plug. Removal could be accomplished by using a piece of tape as a tail on the card.) (Although not recommended, it is possible to put a card in the slot while the reader is plugged in, but the card must be pushed in about 5mm past the opening, which could be done using another card. This can be a minor or major annoyance depending how often one changes cards. This means it is not possible to insert or remove a card unless the reader is unplugged from the USB port. The USB plug must be retracted to insert a card. It locks in both open and closed positions. The USB plug is extended and retracted by a slider on the top side of the reader. Unlike most card readers, this one has no card access light. The reader is deceptively lightweight but feels solid. The plastic is rigid and thick enough to provide durability. The ends of the reader and the slider are high gloss. The exterior of the Extreme Pro UHS-II Reader is plastic with a faux brushed metal appearance. Actual read and write performance of UHS-II cards is typically closer to 250 MB/s. SanDisk advertises this reader with 500 MB/s USB 3.0 performance, which is technically true of USB 3.0, but UHS-II operates at 312 MB/s maximum bus speed. The reader has a second row of pins to support the new UHS-II standard. It is compatible with SD/SDHC/SDXC cards including UHS-I and UHS-II. The SanDisk Extreme Pro UHS-II SD Reader/Writer (SDDR-329) is a high-speed USB 3.0 SD card reader. SanDisk Extreme Pro UHS-II SD Reader Writer USB 3.0 SDDR-329 Introduction
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