Comparison Chart of Memory Types Memory Guide
| Name | Acronym | Physical Size | Capacity Range | Voltage | Notes |
|---|---|---|---|---|---|
| Compact Flash I | CF-I | 43 x 36 x 3.3mm | 2MB to 64GB | 3.3 or 5 | Now most commonly in capacities 512 MB and over |
| Compact Flash II | CF-II | 43 x 36 x 5mm | 2MB to 64GB | 3.3 or 5 | Only notable difference from CF-I is the thickness |
| Memory Stick | MS | 50 x 21 x 2.8mm | 4MB - 128MB | 3.3 | The original Memory Stick is no longer manufactured |
| Memory Stick Duo | MSD | 31 x 20 x 1.6mm | Up to 128MB | 3.3 | Due to capacity limitations, this card has been replaced by the PRO Duo |
| Memory Stick Micro | M2 | 15 x 12.5 x 1.2mm | 128MB - 8GB | 1.8 or 3.3 | Supports lower voltage for use in mobile phones |
| Memory Stick PRO | MSP | 50 x 21 x 2.8mm | Up to 4GB | 3.3 | Designed to support transfer speeds of 160Mbps |
| Memory Stick PRO Duo | MSPD | 31 x 20 x 1.6mm | Up to 16GB | 3.3 | Smaller card designed for use in pocket sized cameras, and mobile phones |
| MicroSD Card | MicroSD | 11 x 15 x 0.7mm | 64MB - 8GB | 2.7 or 3.6 | Used in many popular mobile phones, including the Blackberry and the Motorla RAZR |
| MicroSDHC Card | MicroSDHC | 11 x 15 x 0.7mm | 4GB - 16GB | 2.7 or 3.6 | A higher capacity version of MicroSD, can be used in most of the same devices. |
| MiniSD Card | MiniSD | 21.5 x 20 x 1.4mm | 16MB - 8GB | 2.7 or 3.6 | Usually comes packaged with an adapter, to allow use with a full sized SD slot |
| MiniSDHC Card | MiniSDHC | 21.5 x 20 x 1.4mm | 4GB - 8GB | 2.7 or 3.6 | Can be used in most devices that support the original MiniSD format |
| MultiMediaCard | MMC | 32 x 24 x 1.5mm | Up to 4GB | 3.3 | Compatible with most devices featuring an SD slot |
| MMCmicro Card | MMCmicro | 12 x 14 x 1.1mm | 32MB - 1GB | 1.8 or 3.3 | The smallest MMC card available |
| MMCmobile Card | MMCmobile | 24 x 18 x 1.4mm | 16M - 2GB | 1.8 or 3.3 | The same physical size as earlier RS-MMC cards, with more features |
| MMCplus Card | MMCplus | 32 x 24 x 1.5mm | Up to 4GB | 3.3 | A replacement of the earlier Dual-Voltage MMC |
| Reduced-Size MMC | RS-MMC | 16 x 24 x 1.5mm | 128MB - 2GB | 1.8 or 3.3 | Simply a smaller MMC card, for mobile devices |
| Secure Digital | SD | 32 x 24 x 2.1mm | 8MB - 4GB | 2.7 or 3.6 | Widely used in digital cameras and PDAs |
| SDHC Card | SDHC | 32 x 24 x 2.1mm | 4GB - 32GB | 2.7 or 3.6 | Simply a higher capacity version of the SD card |
| USB Flash Drive | USB | Varies | 64M - 32GB | 5 | Popular in the workplace, and with students |
| XD-Picture | XD | 20 x 25 x 1.78mm | 16MB - 3GB | 3.3 | Used in Olympus and Fujifilm digital cameras |
