Full name: TransFLash, developed by Motorola and SANDISK***, launched in 2004. It is a kind of super small card (11*15*1MM), about 1/4 of the size of SD card, which can be considered as the smallest memory card at present.TF card can be used as SD card after SD card converter. The adapter can be used in devices that use SD as a storage medium.TransFlash is mainly developed for camera phones to capture large images and to be able to download larger video clips.TransFlash cards can be used to store personal data such as digital photos, MP3s, games, and applications for cell phones and personal data, and have a built-in copyright protection and management system to allow downloads of music, images, and video clips to be stored on the card. It also has a built-in copyright protection system to protect downloaded music, videos and games, and future versions of TransFlash will include encryption to protect personal data, financial records and healthcare documents. The compact size of TransFlash allows manufacturers to adopt this design without worrying about the size of the phone, and another flexible application is that it can be replaced by the supplier at any time prior to delivery to meet the different needs of the customer, an advantage not available with embedded flash memory.
Details:
◆Size is about half the size of a SIM card, with a built-in copy protection management system, suitable for a wide range of multimedia applications.
◆With the adapter, it can be used in digital products with an SD card slot.
◆Size: 11mm*15mm*1mm. SDHC stands for Secure Digital High Capacity, and in May 2006, the SD Association released the latest version of the SDHC 2.0 system specification. In May 2006, the SD Association released the latest version of the SD 2.0 system specification, in which SDHC is defined as an SD card that complies with the new specification and has a capacity of more than 2GB and less than or equal to 32GB
The most important feature of SDHC is its high capacity (2GB-32GB). In addition, the SD Association requires SDHC to utilize the FAT32 file system because the FAT16 file system previously used in SD cards supported a maximum capacity of 2GB, which does not meet the requirements of SDHC.
As the successor to the SD card, the main feature of SDHC is that the file format has been upgraded from the previous FAT12 and FAT16 to FAT32, and it supports up to 32GB. meanwhile, the transfer speed has been redefined as Class2 (2MB/sec), Class4 (4MB/sec), Class6 (6MB/sec) and so on. The high-speed SD card can support real-time storage of high-resolution video recordings.
The form factor of the SDHC card is 32x24x2.1mm (LxWxH), the same as the SD card, and the copyright protection features are the same as before, but due to the file system being changed, the SD device that previously only supported the FAT12/16 format is incompatible, and it also supports FAT32 (SDHC) machines, which can read the existing FAT12/16 format SD card. 16 format SD cards.
All SD cards larger than 2G must conform to the SDHC specification, which states that SDHC must conform to at least the Class 2 speed grade, and must have the SDHC logo and speed grade symbol on the card.
There are a number of brands on the market that offer SD cards with capacities of 4GB or more that do not meet these criteria, such as the lack of the SDHC logo or speed grade marking, and these cards can't be called SDHC cards, and technically are not recognized by the SD Association, which would make it very likely that these cards would have compatibility issues with the devices they are used with. The SD Association showed a 2TB capacity SDXC memory card (SD eXtended Capacity) at CES 2009.
SDXC not only has a large capacity, but also its data transfer speed is not bad, according to reports, its maximum transfer speed is expected to reach 300MB / s. With a large capacity memory card, then in the future with the NDS burn card or memory stick vest or other aspects of the friends can be free to throw anything inside, but its data security performance is not clear for the time being. I'm not sure yet. This SDXC memory card uses a NAND flash chip and Microsoft's exFAT file system (the new file system for vista).
(1) SDXC memory cards are currently available in capacities up to 64GB, with a theoretical capacity of 2TB
(2) support for UHS 104, a new ultra-high-speed SD interface specification, the highest of the new SD Memory Card Standard Ver.3.00, which achieves 104MB/s bus transfer speeds on the SD interface, allowing a maximum write rate of 35MB/s and a maximum write rate of 10MB/s, and a maximum write rate of 10MB/s.
(3) The UHS104 provides a legacy SD interface - 3.3V DS (25MHz)/ HS (50MHz), and new SDHC memory cards supporting the UHS104 are compatible with existing SDHC counterparts.
(4) The SDXC memory card is only compatible with SDXC counterparts equipped with the exFAT file system. It cannot be used with SD or SDHC counterparts.
(5) Utilizing the most reliable CPRM copyright protection technology.
(6) UHS104 is a new ultra-high speed interface specification with a data bus transfer rate of 104MB per second. this is the highest standard in the new SD Memory Card Standard Ver. 3.00.
(7) SDXC Memory Card is the next-generation SD memory card standard defined by the SD Association in April 2009 to meet the growing demand for high-capacity storage media with faster data transfer rates for rich storage applications. The new SDXC memory card standard compares favorably to the SDHC memory card standard, which offers capacities ranging from 4GB to 32GB, and achieves capacities that go beyond 32GB to a maximum of 2TB (TB: terabyte, trillion bytes, 1TB = 1024GB).