MMC

MMC may refer to any of the following:

1. Short for MultiMediaCard, MMC is a memory card available as flash memory and ROM used in such devices as car radios, cell phones, igital cameras, PDAs, MP3 players, and printers. Today, there are various variations and sizes of the MMC card such as the MMCP (MMCplus) and MMCM (MMCmobile / MMCmicro). The picture shows an example of a Kingston MMCM 1 GB card.

2. Short for Microsoft Management Console, MMC is a program included with Windows 2000 and above that enables administrators a central location to manage and control all the tasks in Windows. If you have administrative rights, you can access this portion of Windows by clicking Start, Run, and typing mmc and pressing Enter.

NVMe

Non-Volatile Memory Express, also known as NVMe, is a device specification introduced by Intel in 2007. It standardizes the way that non-volatile memory devices, such as SSDs, can be connected to a computer's PCI Express (PCIe) bus.

Traditionally, SSDs are connected to the computer using a disk drive interface such as SATA. However, SATA was designed for older data storage devices such as HDDs (hard disk drives), and its data transfer speed is limited. Beginning in about 2005, when SSDs first became popular with consumers, the fastest SSDs were reading data more quickly than SATA could transfer it. Manufacturers began producing SSDs that could be installed in a PCIe slot, but their interfaces varied widely. The NVMe standard allows any of these devices to be attached to a computer without requiring separate, and possibly conflicting, operating system device drivers.   The photo shows an Intel P3608 SSD, which uses a PCI NVMe 3.0 8x interface.

SDHC card

Short for Secure Digital High Capacity card, the SDHC card is an improved version of the standard SD card with a storage capacity up to 32 GB. Because SDHC works differently then a standard SD card, it is not backward compatible with legacy SD devices.

The 3 versions of the SDHC card, along with their physical dimensions, are shown below.

• SDHC - 32mm x 24mm x 2.1mm.
• Mini SDHC - 21.5mm x 20mm x 1.4mm.
• Micro SDHC - 15mm x 11mm x 1.0mm.

What is the Class Speed Rating?

The SD Association created three speed classes that help identify the write speed for SDHC cards. This Class Speed Rating is shown on the card as a 2, 4, or 6 surrounded by a large C. In the above picture, you can see the 2 surrounded by a C on the first SDHC card. Below, is a break down of these speeds.

· Class 2 = 2 MB a second.

· Class 4 = 4 MB a second.

· Class 6 = 6 MB a second.