M.2 For Mac Card Reader

Turn your MicroSD or M2 Card into a USB 2.0 Flash Drive. Read / Write to your MicroSD or M2 card. 1 x Card Reader. Micro HDMI Cable For olympus XZ-1 XZ-2 SZ-20 SZ-31 MR iHS SZ-12 SZ-14 XZ-1 SZ-1. NOTE: No additional drivers need to be downloaded for the card readers as they are native to the above mentioned supported operating systems. For Mac users, see Troubleshooting USB device on Mac SOLUTION 2 - Verify the reader's status under Device Manager.

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Most of this information originally appeared in our review of Intel's Broadwell NUC. Since it's of general interest to anyone buying or building a PC, we're posting this slightly edited and expanded version as a separate piece to make it easier to find and reference.

Most solid-state drives released within the last year or so have been too fast for the bus they're connected to. The 6Gbps SATA III spec was finalized in the days when rotational hard drives still ruled and SSDs were rare, ludicrously expensive, and relatively unreliable.

There are a couple of different standards that have been created to solve this problem, and they both solve it in the same basic way. One, SATA Express, uses the same physical connector as older SATA drives but uses PCI Express lanes rather than the SATA bus to boost storage speeds. The other, which will be more common in space-constrained mini-desktops, all-in-ones, and Ultrabooks, is called M.2 (previously NGFF, for 'Next-Generation Form Factor').

M.2 is interesting not just because it can speed up storage with PCI Express lanes, but because it can use a whole bunch of different buses too; it stands to replace both mSATA and mini PCI Express, two older standards that have been used for SSDs and Wi-Fi cards in laptops for a while now. Intel's new Broadwell CPUs and their chipsets include native support for M.2 and PCI Express boot drivers—neither PCIe-connected storage (hi Apple) nor the M.2 connector itself are new, but beginning with Broadwell systems each of those two things will become much more common.

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Let's start with the physical connector and the things that connect to it. There's a lot to unpack, starting with the fact that there's more than one kind of M.2 connector, more than one type of interface that can be used with M.2, and more than one kind of M.2 card.

Getting to know M.2

Pictured at the top of this article are four different M.2 cards. The one on the left is a combo Wi-Fi and Bluetooth card. The next one to the right is a Sandisk SSD that uses the SATA bus. The next one is an Intel SSD that also uses SATA. The one on the right is a Samsung SSD that can use up to four PCI Express lanes.

Pay attention to two things as you compare and contrast these cards. First, the physical connector on each card is different; each card has different cutouts in the bottom and exposes different pins. Second, the cards are of different lengths and widths. All of this is accounted for in the M.2 spec (PDF).

The different connectors signify different M.2 'module keys.' Each key exposes a different set of interfaces to each card—M.2 can connect directly to the PCI Express bus, but different pins can be used to connect to the USB 2.0 and 3.0 buses, SATA III, DisplayPort, and a variety of other less-prevalent storage buses. Cards with one notch at the bottom are keyed for one specific kind of connector. Cards with two notches can be used in two different kinds of connectors.

Above is a picture of two M.2 slots on the motherboard of an HP Stream Mini. The slot on the left uses module key E, and the one on the right uses module key B. The Wi-Fi card is keyed for slots A and E, so it fits in the left slot with no problems. The Intel SSD is keyed for slots B and M, so it fits in the right slot. The Samsung SSD is keyed for slot M, so it won't fit in either of the Stream's slots.

KeyCard measurementsInterfacesCommon uses
A1630, 2230, 3030PCIe x2, USB 2.0, I2C, DisplayPort x4Wi-Fi/Bluetooth, cellular cards
B3042, 2230, 2242, 2260, 2280, 22110PCIe x2, SATA, USB 2.0, USB 3.0, audio, PCM, IUM, SSIC, I2CSATA and PCIe x2 SSDs
E1630, 2230, 3030PCIe x2, USB 2.0, I2C, SDIO, UART, PCMWi-Fi/Bluetooth, cellular cards
M2242, 2260, 2280, 22110PCIe x4, SATAPCIe x4 SSDs

The table above lays out the keys in common use today—there are others, mostly placeholders to be called into service as newer buses and interfaces are introduced.

Note the four- or five-digit numbers paired with each slot. These are actually codes to refer to the physical dimensions of each card; the first two digits specify the width in millimeters and the second two or three digits specify the length. Our Wi-Fi module is 16mm wide and 30mm long, or 1630. Two of our SSDs are 22mm wide and 80mm long, or 2280. The other SSD is 22mm wide and 42mm long, or 2242. All motherboard slots are 22mm in width, even the ones attached to 30mm-wide cards.

All current keys can give cards access to two PCI Express lanes, but otherwise interface compatibility is all over the place—so far, it's been pretty easy to guess what kind of peripheral you're dealing with based on the key it uses. Wi-Fi and WWAN cards tend to use keys A and/or E, since they only need the PCI Express or USB 2.0 buses and only need 30mm in length to fit all their key components. SATA SSDs and SSDs that use two PCI Express lanes tend to use keys B and M to maximize compatibility, since both connectors can deliver both SATA III and two PCIe lanes. The very fastest SSDs tend to be M-keyed since it's the only one that delivers four PCIe lanes.

This is a lot to digest, but it's most of what you need to know to understand M.2. There are some other stipulations around the physical thickness of the cards that you can read about in the documentation, but they aren't as important to our discussion today.

The key system isn't always foolproof—our A- and E-keyed Wi-Fi module will physically fit into the B-keyed SSD slot even though the computer won't recognize it there. M.2 is certainly more confusing than the mPCIe and mSATA specs, but in the end it's more flexible. Components can access many different buses through one small internal connector, and you've got a lot of different physical card sizes to play with instead of being tied to either a 'full-height' or 'half-height' card.

The worst thing about M.2 right now is a general scarcity of components. OEMs buying parts directly from manufacturers probably have more choices, end users buying M.2 cards from Newegg or Amazon will find that they have few options, especially compared to the selection of mSATA and mPCIe components. That will change as M.2 goes mainstream and those older connectors begin to fade. Broadwell is a big step forward in that transition.

Computer Memory Card Readers and Adapters

Memory cards, which are also called flash cards and memory cartridges, are a type of portable data storage. The storage is non-volatile, and that persistence and portability make it an ideal storage solution for smartphones, tablets, and many other portable gadgets. Readers and adapters are what make these memory sticks usable across Windows PCs, laptops, Android devices, and more.

In addition, please review the for more information regarding card reader requirements. To get started you will need: • CAC (see below) • Card reader You can get started using your CAC on your Mac OS X system by following these basic steps: • Get a card reader Typically Macs do not come with card readers and therefore an external card reader is necessary. Best cac reader for a mac. At this time, the best advice for obtaining a card reader is through working with your home component.

What is a memory card reader?

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A card reader is a device that accepts compact flash media for reading and writing. Broadly, there are two kinds of readers: internal and external. Examples of internal card readers include the micro SD slot on a tablet, a memory card slot on a camera, or an SD card slot on a laptop. External readers may be standalone or part of a hub and often connect to the computer or other device via USB.

What is a memory card adapter?

An adapter is often like a cross between an external and internal memory card reader. A card reader that connects to a computer via a USB port is an external solution. A reader that accepts micro SD cards by attaching to an internal SD card reader is an adapter. Both are interfacing, but the difference is that the second solution is acting as pass-through to an internal mechanism.

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Do I need a different reader for each card type?

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It depends. Some slots have a versatile connector that can, for instance, accept either SD or micro SD. Others accept only one card type or some but not others. Hubs are often quite versatile and convenient because they can feature multiple memory card readers, USB ports, and other connections in a form compact enough to be portable.

What card reader types are available?

Many memory stick standards have been developed over the years, and certainly, many more will be introduced in the years to come as the technology and standards advance. Some of the formats that have been prevalent over the years include:

  • SD: SDSC stands for Secure Digital Standard Capacity. These cards feature a write-protect notch and are 2.1 millimeters thick.
  • SDHC: The Secure Digital High Capacity format built on SD by supporting capacities up to 32 GB.
  • SDXC: The Secure Digital eXtended Capacity format expands the base SD card format even more by supporting capacities up to 2 TB.
  • Micro SD: This is a form factor extension to SD that allows for smaller physical cards. SDHC and SDXC are supported as well.

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What USB connections are available for reader hubs?

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  • USB 2.0: This USB connection has an effective throughput of 35 MB/s.
  • USB 3.0: This SuperSpeed implementation has an effective throughput of 3.2 Gbit/s.
  • USB-C: This USB version has a reversible plug for easier use.
  • Micro USB: This smaller physical connection is common on portable devices.
  • USB OTG: On-the-Go connections can serve as host for other USB devices.