Computer Memory Card Readers and Adapters

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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.

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What is a memory card reader?

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?

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.

What USB connections are available for reader hubs?

• 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.

1. Ensure your CAC reader works with Mac
2. Check to ensure your Mac accepts the reader
3. Check your Mac OS version
4. Check your CAC’s version
5. Update your DOD certificates
6. Guidance for Firefox Users
7. Look at graphs to see which CAC enabler to use

Step 1: Purchase a Mac Friendly CAC Reader

Purchase a CAC reader that works for your Mac. There are only a couple that you can choose from and I’ve listed them below.

If you already have a CAC reader and it isn’t Mac friendly, you could update the firmware, however, for the non-tech savvy people out there, it’s probably better to just purchase a new one and save the headache – they’re only ~$11-13 dollars.

Best Mac Compatible CAC USB Readers

Best Mac Compatible CAC Desk Readers

Step 2: Plug in and Ensure It’s Accepted

Once you have your CAC reader, plug it into your Mac and ensure your computer recognizes it. If you have one of the CAC readers we suggested above, then you should be good to go.

If you are testing a different version, then verify that your Mac accepts your CAC reader by following these steps.

If for some reason your CAC reader isn’t working, then try the following steps.

Step 3: Update Your DOD Certificates

Now that you have your CAC reader connected and accepted on your Mac computer, it’s time to ensure you have the right certificates in order to access DOD CAC required web pages.

If you are using Chrome or Safari, then follow step 3a below. If you are using Firefox, you’ll need to do some extra steps:

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1. Type ⇧⌘U (Shift + Command + U) to access your Utilities
2. Find and Double click “Keychain Access”
3. Select “Login” and “All Items”
4. Download the following four files and double click each once downloaded so as to install in your Keychain Access.
5. When you double-click the Mac Root Cert 3 and 4, you’ll need to tell your browser to always trust them. Click the button like you see below:

Additional Steps for Firefox

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1. Download All Certs zip and double click to unzip all 39 files
2. While in Firefox, click “Firefox” on the top left, then “Preferences”
3. Then Click “Advanced” > “Certificates” > “View Certificates”
4. Then Click “Authorities” and then “Import”
5. Import each file individually from the “AllCerts” folder. When you do this, the below box will popup. Check all three boxes and click “OK”

Step 4: Download and install CAC Enabler

1. Download zip
2. Double click the .zip file
3. Because this is from an unidentified developer, you’ll need to hold down “Control” and click the program. Now select open and continue with install procedure.
4. After installing, restart your computer

CAC Access at Home Success

Now that you have a CAC reader, certificates, and a CAC Enabler, you should now be able to access any CAC-enabled website and log on using your CAC password and data.

Common Reasons Why Your CAC Card Won’t Work On Your Mac

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Ensure Your CAC Card Meets the Standards: In order for your CAC card to work, it must meet the minimal requirements. Currently, there are only four types of CAC cards that can be used. The ensure you have the right CAC card for online access, flip your CAC card to the back and if you have one of the below numbers written on the top left, then you are good to go:

• G&D FIPS 201 SCE 3.2
• Oberthur ID one 128 v5.5 Dual
• GEMALTO DLGX4-A 144
• GEMALTO TOP DL GX4 144

If you do not have any of the above written on the back, then proceed to your nearest PSD to get a new CAC card issued.