Memory-card, SD, High Tech Product, Cheap, Lowest price

Memory card SD
Memory card SD
Memory card SD

Memory-card, card SD, Cheap, High Tech Product, Lowest price

What is a memory card (SD card)?  memory card SD, high tech product,cheap, lowest price

The memory card is high tech product removable digital data storage unit which replaced the film of old cameras, on digital cameras.

The operating principle has been put in place after an agreement between the three giants :

- Panasonic, 
- Toshiba,
- SanDisk.

Cards exist in three formats :

- The memory card SD,
- The memory card miniSD (practically not used),
- The memory card microSD.

These formats exist in three standards

- SD cards (Secure Digital),
- SDHC cards (Secure Digital High Capacity),
- SDXC cards (Secure Digital Extended Capacity).

Cards SD have capacity between 128Mo à 2Go. Its default format is FAT16 and works with all SD, SDHC, or SDXC compatible devices.
The SDHC card has a capacity ranging from 4GB to 32GB, Its default format is FAT32 and works differently than standard cards. 
The SDXC card has a capacity ranging from 64GB to 2TB. Its default format is exFAT.

The UHS-I specificity defines two bus architecture options of up to 50MB / s (UHS-50) and 104MB / s (UHS-104) data transfer rate.

UHS-II specificity defines bus architecture for 156MB/s and 312MB/s options. 
Write / read speed and class of SD cards

Write and read speeds are important for users of high-end devices.

The class is displayed surrounded by a C or placed in an U.

The SD Card Association has sorted speeds into two major classes which are the Speed ​​class and the UHS Speed ​​class.

The Speed ​​class is based on the index and indicates speed: 2 (for 2 MB/s), 4 (for 4 MB/s), 6 (for 6 MB/s) and 10 (for 10 MB/s)

UHS class (Ultra High Speed) uses minimum write speeds to differentiate between cards. Thus UHS-1 has a minimum write speed of 10 MB/s while UHS-3 has a minimum write speed of 30 MB/s.

There is one very last type of class. These are video speed classes. They are symbolized by the letter V accompanied by a numeral. For now, there is:

- V6 write speed max 6 MB/s,
- V10 write speed max 10 MB/s, class U1,
- V30 write speed max 30 MB/s, class U3,
- V60 writing speed max 60 MB/s,
- V90 write speed max 90 MB/s.

The first 3 support the 4K and the last 2 support the 8K.
There are four speed classes and two U :



defining the minimum right rate.

Class 2 (resp. 4, 6 10, U1, and U2) is equivalent to 2 Mo/s (resp. 4, 6, 10, 10 et 30).

Some manufacturers use the MB/s as a unit while others opt for the X which is worth 150 KB/s, so 600X is the same as 90 MB/s.

SD - SDHC - SDXC Cards 
and micro SD - SDHC - SDXC cards

Among the array of card manufacturers, four names are presented here :

- Kingston,
- Toshiba,
- Samsung,
- SanDisk,

Of course, there are several others :

- Patriot,
- Silicon Power,
- Amplim,
- and even Raspberry for special use.

What to choose ? 

For the selected manufacturers, only their 16, 32 and 64 GB cards are on display.


   - UHS-1 class 10,
   - Ideal for shooting cinema,
   - Quality full HD videos,
   - Read speed of up to 45 MB/s,
   - Waterproof, temperature proof,
   - Shock and vibration proof,
   - X-ray proof.

   - UHS-1 class 10,
   - Capacities 16, 32, 64 and 128 GB,
   - Quality full HD videos,
   - Read speed of up to 80 MB/s,
   - Waterproof,
   - New version of SD10V.

   - UHS-1 speed class 3 (U3),
   - Compatible µSDHC/SDXC devices,
   - Quality full HD videos,
   - 90 MB/s read and 45 MB/s write,
   - Waterproof and temperature proof,
   - Multiple capacities.
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      EVO Plus

   - UHS-1 speed class 3 (U3),
   - Ideal for cinema quality HD video,
   - Ideal for photos of subjets,
   - Up to 90 MB/s read and up to 45 MB/s write,
   - Compatible with µSDHC and µSDXC devices,
   - Multiple capacities.
   - Waterproof and temperature proof.
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   - Compatible SDHC/SDXC devices,
   - Compatible SDHC-1/SDXC-1 devices,
   - Read speed up to 80 MB/s,
   - Write speed just lower,
   - Resistant to water and temperature,
   - Resistant to x-rays and shocks.
   - Waterproof and temperature proof.
      Ultra µSD

   - Support high quality video recording,
   - Ideal for smartphones and tablets,
   - Apply to digital cameras,
   - Read speed up to 100 MB/s,
   - Tested to have durability,
   - Many capacities.
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Toshiba products
      Exceria Pro SD

   - Paired with UHS-1 compatible devices,
   - Ideal for cameras and camcorders,
   - UHS-1 class 10 U3
   - Read speed up to 95 MB/s,
   - Write speed up to 75 MB/s.
      Exceria Pro µSD

   - Compatibility with large range of devices,
   - Easy to handle 4K video,
   - Read speed up to 270 MB/s,
   - Write speed up to 150 MB/s.
   - Can work in bad environment.
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How to use the memory card

A memory card can be used in two different ways:

- as memory for internal storage,
- as memory for external storage.

Let's see the difference:

The mode for external storage is that practiced by all those who pass their memory card from one device to another to view their multimedia files. The card is read by other devices but can not be reformatted with the portable storage memory mode.

This type of storage is recommended with cards of the lower classes (2, 4 and 6).

The use as memory for internal storage is adopted by those who want to increase their internal storage memory to install games and applications.

The card must be formatted on the device that will receive it afterwards. The switchover will be done automatically.

It should be noted that Android formats a card in such a way that it will be impossible to read it on another device.

Turn an external card into an internal storage

This operation is possible thanks to the Adoptable Storage function which came into being with the arrival of Android 6 but which is not widespread on all smartphones.

The storage of applications is done in the device while the storage of multimedia files can be done on the card. It should be noted that you will take cards of class 10 or more.