The card used for the radio may be a mobile phone memory card, or it may not be a mobile phone memory card.
Memory cards come in various specifications.
SD card memory card is an independent storage medium used in mobile phones, digital cameras, portable computers, MP3 and other digital products. It is generally in the form of a card, so it is collectively called "memory card", also known as For "digital memory card", "digital memory card", "storage card", etc. Memory cards have the advantages of small size, easy portability and simple use. At the same time, since most memory cards have good compatibility, it is easy to exchange data between different digital products. In recent years, with the continuous development of digital products, the storage capacity of memory cards has been continuously improved, and their applications have become rapidly popular.
MMC, due to the large size of traditional CF cards, Infineon and SanDisk jointly launched a new memory card product MultiMedia Card (MMC card for short) in 1997. The size of the MMC card is 32mm × 24mm × 1.4mm. It uses a 7-pin interface and does not have a read-write protection switch. Mainly used in digital cameras, mobile phones (such as Siemens MP3, mobile phone 6688), and some PDA products.
SD cards are a bit bloated for small digital products such as mobile phones. At the same time, in order to catch up with Duo and Xd, the SD card camp released a smaller memory card called "miniSD". Its overall dimensions are 20mm × 21.5mm × 1.4mm, the packaging area is 44% of the original SD card, the volume is 63% of the original SD card, and it has 11 gold fingers (the SD card only has 9). It can also be used as an SD card through an adapter card. This card is widely used in Dopod, Panasonic and other mobile phones.
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.
Full name: TransFLash, jointly developed by Motorola and SANDISK ***, 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 small 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 not available in embedded flash memory. .