MicroSD, MicroSDHC and MicroSDXC memory cards are among the most popular consumer solutions for PCs and other devices on the market. What are the features of each of the marked types of devices?
Facts about MicroSD
Memory card format MicroSD - historically one of the earliest in the line of SD standards (or Secure Digital - its creation was the result of further development and improvement of the MMC flash memory standard). MicroSD cards are widely used - among users of PCs, smartphones, tablets, cameras and camcorders.
The maximum capacity for MicroSD cards is 2 GB. The standard size of products of this type is 11 by 15 mm with a thickness of 1 mm. The maximum speed of writing and reading data on a card of the corresponding type is 25 Mb / s.
Facts about MicroSDHC
This flash memory standard is the result of further technological development of the previous format. The corresponding type of memory card has the same size as a microSD card, but has several times the capacity - 4-32 GB. In addition, they are characterized by a higher data write and read speed - 50-150 MB / s.
Please note that MicroSDHC cards in most cases cannot be recognized by MicroSD readers. In turn, problems with backward compatibility of cards and card readers usually do not arise. This is because the MicroSD standard only supports file systems such as FAT 12 and FAT 16 (in various modifications), while MicroSD cards are formatted in FAT 32.
Facts about MicroSDXC
The next technological step in the development of the standard SD - cards MicroSDXC. Their main advantage is their very large capacity, which can range from 32 GB to 2 TB. But the size of the card is the same as in the previous modifications - 11 by 15 mm with a thickness of 1 mm. The MicroSDXC uses the exFAT file system.
The speed of writing and reading data on microSDXC cards is 50-312 Mb / s. The specific indicator depends on the version of the device. Mod 3.0 cards that support the UHS-1 standard write and read data at speeds up to 104 Mb / s. Devices in version 4.0, compatible with UHS-2 technology, can provide an indicator of 312 MB / s.
MicroSDXC card readers are capable of recognizing MicroSD and MicroSDHC standards. In turn, card readers adapted for MicroSD and MicroSDHC are not compatible with MicroSDXC devices.
Comparison
The difference between MicroSD, MicroSDHC and MicroSDXC should be sought in the following aspects:
- card capacity;
- Supported read and write speeds;
- used file system;
- Interoperability of card readers adapted to specific types of cards.
The size of all types of cards is the same.
More clearly the difference between MicroSD, MicroSDHC and MicroSDXC-cards in relation to the marked points can be displayed in the form of a small table.
Table
| MicroSD | MicroSDHC | MicroSDXC |
| What do they have in common? | ||
| All card types are technological varieties of the SD standard, or Secure Digital | ||
| MicroSDXC card readers can recognize cards MicroSD and MicroSDHC | ||
| Cards have the same purpose - data storage, which can be accessed using PCs, smartphones, tablets, cameras | ||
| All types cards have the same size - 11 by 15 mm with a thickness of 1 mm | ||
| What is the difference between them? | ||
| Compatible with any reader | Compatible only with readers for MicroSDHC and MicroSDXC | Compatible only with readers for MicroSDXC |
| Up to 2GB capacities | 4-32GB capacities | 32GB to 2TB capacities |
| Write and read data at speeds up to 25 MB / s | Have a write and read speed of 50-150 MB / s | Have a write and read speed of 50-312 MB / s |
| The cards are formatted in FAT 12 or FAT 16 | Formatted in FAT 32 | Formatted in exFAT |
