• Slots 1 - Secure Digital (sdxc)
• Secure Digital (sdxc) Slot Machines

Many laptops, cameras, and mobile phones have built-in slots for small memory cards. There are three different types of memory cards: Secure Digital (SD), Secure Digital High Capacity (SDHC), and Secure Digital Extended Capacity (SDXC). Take a look at the differences below. SD Memory Cards. Image via Flickr by mobilyazilar. Secure Digital (SD) cards are flash memory cards that comply with standards set by the SD Association. Hemera/ Thinkstock Many laptops and mobile devices you can buy today have built-in slots for Secure Digital memory cards, usually just called SD cards. A Secure Digital (SD) memory card is a digital memory card that utilizes the non-volatile memory card format developed by the SD Card Association (SDA) for use in portable devices. The SD technology is used by more than 400 brands across dozens of product categories and more than 8,000 models. Some Mac computers feature an SD (Secure Digital) or SDXC (Secure Digital Extended Capacity) card slot that lets your Mac read and write data to SD media, such as digital camera memory cards. Secure Digital card (SD card): A Secure Digital (SD) card is a tiny flash memory card designed for high-capacity memory and various portable devices, such as car navigation systems, cellular phones, e-books, PDAs, smartphones, digital cameras, music players, digital video camcorders and personal computers.

Apple Compatible iMac SDXC - SDHC - SD Cards

Aluminum Intel iMac SD Slot Location

Starting with the glass panel unibody aluminum iMac desktop computers, Apple started including an SDHC card slot on the right-hand side of the machines located just below the SuperDrive CD/DVD burner opening.
Later models revised the slot to support SDXC - (e)Xtended Capacity cards up to 1 Terabyte. So the model / year of your iMac system will determine if it’s SD and SDHC compatible, or if it’s a later model that also supports SDXC as well.

Slim Aluminum Retina iMac SDXC Slot Location

Apple continued to include an SDXC compliant, SDHC - SD backward compatible Secure Digital memory card slot on the slimmer aluminum iMac systems. This revision moved the slot the rear of the iMac alongside the audio, Gigabit ethernet, USB 3.0 and ThunderBolt ports instead of on the right-hand side of the display. The slot remains on the latest Thunderbolt 3 Retina iMac's as well.

iMac SDXC Card	SDXC Card For iMacs	SDHC Card For iMac
SanDisk Extreme Pro SDXC Up To 95MBps Speed	PNY Elite SDXC Card Up To 90MBps Speed	Transcend Class 10 Up to 90MBps

Slots 1 - Secure Digital (sdxc)

Secure Digital (sdxc) Slot Machines

With the latest generation of Secure Digital flash memory SD cards at the high-end, we're seeing Read / Write speeds rivaling and outperforming conventional mechanical hard drives. So, not only has capacity increased but speed has increased greatly - though the data rates still fall far short of full-blown solid-state drives.