The Best SD Card Readers Updated August 30, 2017 After a new round of research and testing, we found that the Unitek USB-C Card Reader is the best USB-C SD card reader for most people. Nexto D1 ND2901 Digital Photo Storage (750GB) Adorama price: $449.00. At the high end is Nexto, which is designed to streamline the process of backing up data from USB-compatible devices (such as direct from camera) and CF and all flavors of SD memory cards. A small 1.44-inch LCD monitor lets you see thumbnail photos.
The SD slot located on the back of some Mac Mini models is a Secure Digital memory card reader. The SD memory card standard is the industry removable storage leader: the memory card type is commonly used in the standard, mini and micro form factors in devices like cellular phones, digital cameras and tablets. According to photojournalism website PetaPixel, Apple began producing the Mac Mini with a built-in SD card reader in mid-2010. The built-in reader permits the computer to interface with SD cards without needing a USB adapter.
Mac Mini Models
The Mac Mini is the smallest form-factor Macintosh computer available. The Mac Mini's design is focused on being a space-efficient, inexpensive computing platform for the average user -- it is not a performance workstation. Mac Minis are often purposed as home theater PCs by virtue of their size and capabilities. According to Apple, the Mac Mini is designed so that the person using it can replace his computer and continue using existing peripheral devices like monitors, keyboards and mice.
SD Card Standards
SD memory cards are a type of flash memory storage device: they don't require moving parts to access and store data. Three SD card device generations offer increased capacity and performance over earlier generations: SD, SD High Capacity and SD Extended Capacity. The fastest, SDXC, was introduced in 2009. SD cards offer 2GB of storage capacity; SDHC cards offer 32GB; and SDXC cards provide 2TB of storage capacity. Mac Mini models with SD card readers support all three generations; however, SD readers can only use cards from the device's generation and prior generations. So an SDHC reader can't read SDXC cards, but an SDXC reader can read SD and SDHC cards.
SD Card Adapters
The Mac Mini's SD card slot can work with microSD and miniSD cards, but the cards must be placed inside of an adapter. MicroSD and miniSD cards often include a full-sized SD reader adapter that looks just like a full-sized card but features a connection slot for the smaller card. The Mac Mini's reader is too large to work with miniSD and microSD cards, which may get stuck in the slot if inserted. Many mobile devices such as cellular phones and cameras use the smaller microSD and miniSD standards to reduce the size of the device by using a smaller card slot.
Using the SD Slot
Any SD card properly inserted into the Mac Mini's SD slot will be recognized by the operating system as a USB storage device. Insert the card into the reader slot with the connectors facing down and towards the device. The card will slide in and click into place. The Mac Mini will mount and access the card automatically. Drag the card's icon into the trash to unmount the device before ejecting it to prevent data corruption. SD cards can be removed from a powered-down Mac Mini without a problem.
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The lack of an SD card slot on the 2016 and 2017 MacBook Pro is an inconvenience for photographers of all stripes who shoot with cameras other than the iPhone. The answer—as with everything else that needs to connect to the USB-C–only MacBook Pro—is an external USB-C SD card reader.
But which one? As you would expect, third parties have rushed to create adapters for everything, including memory card readers. And to no one’s surprise, the quality, specifications, and prices are all over the map.
We tested six adapters that stood out among the field based on online reviews, word of mouth, and design. All of the adapters read and write to SD cards, and we tested one model—the IOGEAR USB-C 3-Slot Card Reader/Writer—that also accepts larger CompactFlash (CF) cards still used by some high-end cameras. Choosing which reader is best for you depends a lot on what you need and how much you’re willing to spend. For most people, that could turn out to be one of the least expensive of the bunch.
Before you view the picks, you may want to consult our SD Card explainer to understand the stew of acronyms and jargon the industry uses to describe memory card storage and speed.
Best card reader for speed
The SanDisk Extreme Pro UHS-II USB-C Reader is pricey ($49 on Amazon, and unlike the other adapters we tested, it has just a single SD card slot—no microSD, CF, or USB-A ports to extend its versatility.
But it’s fast.
On one hand, the speed is due to its UHS-II compatibility, transferring up to a theoretical 312 MBps from UHS-II memory cards that include a second row of contacts from which to read data. In our real-world tests, we recorded an average throughput of 195.45 MBps for photos and 267.67 MBps for video; the latter’s increase is due to the reduced amount of overhead needed to copy nine files versus 684 files.
That said, even when copying from more common UHS-I cards, which top out at a theoretical speed of 104 MBps, the SanDisk Extreme Pro UHS-II USB-C Reader bested the other adapters we tested. It copied our suite of photos at a rate of 86.68 MBps and video at 101 MBps.
We also liked the fairly compact design, with its bendy neck and minimal footprint, although the angle of the case where you insert the SD card makes extracting a card less elegant than needed.
But if you’re shooting with a camera that works with UHS-II cards and you need the fastest copy turnaround, the cost is worth it.
Best value for UHS-II cards
If you’re willing to give up a few seconds and don’t want to pay a premium for speed, the Verbatim USB-C Pocket Card Reader is nearly as fast as the SanDisk Extreme Pro when copying from UHS-II cards and costs just $17 on Amazon.
In our testing, we found an average throughput of 179.36 MBps for photos and 221.89 MBps when transferring video files. The Verbatim reader is a little more bulky, and sports a short cable for the USB-C plug, but it also features slots for SD and Micro SD cards.
Best combination of price and performance
What if, like most current photographers, you’re not yet capturing to UHS-II cards? For an adapter that has a great combination of price and performance, we like the Cable Matters USB 3.1 Type-C Dual Slot Card Reader ($12 on Amazon).
We expected to run into tradeoffs at this price, but the Cable Matters adapter was almost as fast as the SanDisk adapter. Our photos transferred at 82.17 MBps, while videos zipped along at 95.6 MBps.
The adapter has dedicated SD and microSD card slots that can be used simultaneously, and a discrete LED to indicate the adapter is getting power. With dimensions of just 2.8 x 5.4 x 0.5 inches and a 6-inch cable, it doesn’t add bulk to any bag.
If you don’t need UHS-II compatibility, the Cable Matters USB 3.1 Type-C Dual Slot Card Reader is the one to get.
How we tested
Mac Card Reader Driver
We copied two sets of photos and videos from a SanDisk Extreme Pro SDXC card rated at 95 megabytes per second (MBps). For photos, we timed three transfers of 12.9GB of JPEG and raw images (684 files) and averaged the results. For video transfer, we copied 31GB (9 files) from the same card.
We also copied the same files using a SanDisk Extreme Pro SDHC UHS-II card rated at 280 MBps to test the difference that UHS II compatibility affords. And for the CF reader, we used a SanDisk Extreme CF card rated at 120 MBps (UDMA 7) to copy 7.7GB of JPEGS (402 files), since that card’s capacity maxed out at 16GB.
All of the testing was done on a 2016 MacBook Pro with TouchBar equipped with a 2.7GHz Intel Core i7 processor, 16GB of RAM, and a 1TB SSD. We used the Image Capture utility to facilitate the transfer of photos, and copied the video files using the Finder.
Cac Card Reader For Mac
Bottom line
If you really need the top speeds afforded by UHS-II cards and devices that read them, we recommend the SanDisk Extreme Pro UHS-II USB-C Reader. For everyone else, however, our favorite USB-C memory card reader is the Cable Matters USB 3.1 Type-C Dual Slot Card Reader. It’s fast, small, and inexpensive—the attributes you want so you can spend your time and money on capturing photos.
Smart Card Reader For Mac
To read the full reviews of each product we tested, click the product name in the list below, and then click the “Read the full review” link that appears.