What is the difference between SD card and mobile phone memory card?
SD card: It is a flash memory card, usually used in digital cameras, mobile phones or handheld computers. Because it is flash memory, it can be used to store files, similar to a USB flash drive. However, a card reader is required to read or write to the SD card on an ordinary desktop computer. ?
Memory card: The mobile phone itself has a certain memory capacity. In order to meet people's personalized needs for mobile phone memory, many modern mobile phone brands and models are equipped with external memory, which is commonly referred to as mobile phones. Memory card, mobile phone memory card is called TF card, also known as MicroSD (micro SD card), which is of course commonly used in mobile phones.
Micro SD card is an extremely small flash memory card. Its format was invented by SanDisk. Originally this memory card was called T-Flash, and later renamed Trans Flash; and was renamed The reason for Micro SD is that it was adopted by the SD Association (SDA). Other memory cards adopted by SDA include Mini SD and SD cards. It is mainly used in mobile phones, but due to its small size and increasing storage capacity, it has been used in GPS devices, portable music players and some flash memory disks. Its size is 15mm x 11mm x1mm, which is almost the same size as a fingernail. It is the smallest memory card currently available. It can also be connected to the SD card slot via an SD adapter card. Currently, MicroSD cards provide capacities of 128MB, 256MB, 512MB, 1G, 2G, 4G, 8G, 16G, 32G, 64G, and 128G (during the MWC 2014 World Mobile Communications Conference, SanDisk broke the tradition of memory cards with a maximum capacity of 64GB , officially released a Micro SD XC? memory card with a capacity of up to 128GB.
SD memory card is a new generation of memory device based on semiconductor flash memory. Due to its small size and high data transfer speed. With excellent features such as fast speed and hot-swappability, it is widely used in portable devices, such as digital cameras, personal digital assistants (PDA in foreign languages) and multimedia players. Extended content:
SD card. Series
SD card
Secure Digital card is referred to as SD card, from the word
SD card illustration, including size description (4 pictures)
Understandably, this card is a security card, which has better security performance than CF cards and early SM cards. It is a brand-new storage jointly developed by Japan's Panasonic, Toshiba and SanDisk. The biggest feature of the card product is the encryption function to ensure the security and confidentiality of data. In many ways, the SD card can be regarded as an upgrade of the MMC. The appearance and working method of the two are the same, but the thickness of the MMC card is slightly higher. It is thinner, but all machines using SD card devices can use MMC cards. Its dimensions are 32mm×24mm×2.1mm.
miniSD
SD cards are suitable for small digital products such as mobile phones. It is slightly bloated, and in order to catch up with Duo and Xd, the SD card camp has released a smaller memory card than the original, called "miniSD". Its dimensions are 20mm × 21.5mm × 1.4mm, and the packaging area is the same as the original SD card. 44. The size is 63% of the original SD card and has 11 gold fingers (the SD card only has 9). The card can also be used as an SD card through an adapter card and is widely used in Dopod, Panasonic and other mobile phones.
microSD
The microSD card standard was formulated by the SD Association in 2005 with reference to the relevant standards of T-Flash. T-Flash cards and microSD cards are compatible with each other.
Compared with miniSD card, microSD card is smaller in size, measuring 11mm×15mm×1.4mm. It is only about a quarter of the size of standard SD card and is the smallest memory card currently on the market.
T-Flash card
Full name: TransFLash, jointly developed by Motorola and SANDISK*** in 20
T-Flash card, also known as TF card , including size instructions (2 photos)
Launched in 2004. It is an ultra-small card (11*15*1MM), which is about 1/4 of the SD card. It can be regarded as the smallest storage card currently. The TF card can be used as an SD card through an SD card converter. The adapter can be used on devices that use SD as storage media. TransFlash was primarily developed for camera phones to capture large images and download larger video clips. TransFlash cards can be used to store personal data, such as digital photos, MP3s, games, applications for mobile phones, and personal data. It also has a copyright protection management system to protect downloaded music, images, and games; new models will be launched in the future. TransFlash is also equipped with encryption capabilities to protect personal data, financial records and health and medical documents. The compact size of TransFlash allows manufacturers to adopt this design without worrying about the size of the phone. Another flexible application is that it allows suppliers to make replacements at any time according to different customer needs before delivery. This advantage is?[1]?Embedded This is not available in conventional flash memory.
Detailed description:
◆The volume is approximately equal to half a SIM card, and it has a built-in copyright protection management system and is suitable for a number of [2] multimedia applications.
◆After matching with the adapter, it can be used on digital products with SD card slots.
◆Size: 11mm*15mm*1mm.
SDHC
SDHC is the abbreviation of "Secure Digital High Capacity", which is "high-capacity SD memory card". In May 2006, the SD Association released the latest version of the SD 2.0 system specification, which stipulates that SDHC is an SD card that complies with the new specification and has a capacity greater than 2GB and less than or equal to 32GB
The biggest feature of SDHC is its high Capacity (2GB-32GB). In addition, the SD Association stipulates that SDHC must use the FAT32 file system. This is because the FAT16 file system previously used in SD cards supports a maximum capacity of 2GB, which cannot meet the requirements of SDHC.
As the successor of SD card, the main feature of SDHC is that the file format has been upgraded from the previous FAT12 and FAT16 to FAT32, and supports up to 32GB. At the same time, the transmission speed has been redefined as Class2 (2MB/sec), Class4 (4MB/sec), Class6 (6MB/sec), etc. The high-speed SD card can support real-time storage of high-resolution video recording.
The overall dimensions of the SDHC card are 32×24×2.1mm (length×width×height). It is the same as the SD card, and the copyright protection functions are also the same as before. However, due to the change of the file system, it was only supported in the past. FAT12/16 format SD devices are incompatible, and machines that also support FAT32 (SDHC) can read existing FAT12/16 format SD cards.
All SD cards with a capacity greater than 2G must comply with the SDHC specification. The specification states that SDHC must comply with at least Class 2 speed level, and there must be an SDHC logo and a speed grade logo on the card.
There are 4GB or higher capacity SD cards provided by some brands on the market that do not meet the above conditions, such as lack of SDHC logo or speed grade logo. These memory cards cannot be called SDHC cards. Strictly speaking, these cards cannot be called SDHC cards. Currently, they are not recognized by the SD Association, and compatibility issues with devices are likely to occur when using such cards.
SDXC
The SD Association demonstrated a 2TB capacity SDXC memory card (SD eXtended Capacity) at CES 2009.
SDXC not only has a large capacity, but also has a high data transmission speed. According to reports, its maximum transmission speed is expected to reach 300MB/s. With a super-large-capacity memory card, you can use an NDS flash card or a memory stick vest or other friends to throw anything into it at will. However, it is not yet clear how its data security performance is. This SDXC memory card uses NAND flash memory chips and uses Microsoft's exFAT file system (vista's new file system).
(1) The current maximum capacity of SDXC memory cards is 64GB. The theoretical capacity is 2TB
(2) Supports UHS 104, a new ultra-high-speed SD interface specification, the highest standard of the new SD memory card standard Ver.3.00, which achieves 104MB per second on the SD interface bus transfer speed, achieving a maximum write speed of 35MB per second and a maximum read speed of 60MB per second.
(3) UHS104 provides a traditional SD interface - 3.3V DS (25MHz)/ HS (50MHz). New SDHC memory cards that support UHS104 are compatible with existing SDHC corresponding devices.
(4) SDXC memory cards are only compatible with SDXC corresponding devices equipped with exFAT file system. It cannot be used with SD or SDHC corresponding devices.
(5) Adopt the most reliable CPRM copyright protection technology.
(6)UHS104 is a new ultra-high-speed interface specification with a data bus transmission rate of 104MB per second. This is the highest standard among SD new memory card standards Ver.3.00 [5].
(7)SDXC memory card is the next generation SD memory card standard defined by the SD Association in April 2009. In order to meet the growing demand for large-capacity storage media, it provides faster data transfer rate. Compared with the SDHC memory card standard that provides capacities from 4GB to 32GB, the new SDXC memory card standard can achieve capacities exceeding 32GB and up to 2TB (TB: terabyte, trillion bytes, 1TB=1024GB).