There are Currently 12 different types flash memory cards in market including
1. XD Card
2. TransFlash Card
3. Smart Media(SM) Card
4. Mini-SD Card
5. SD (Secure Digital) Card
6. RS-MMC (Reduced Size MMC) Card
7. MMC (Multimedia Card) Card
8. Memory Stick Pro
9. Memory Stick Duo
10. Memory Stick (MS)
11. Compact Flash Type II
12. Compact Flash Type I.
You must be just astonished by this list. This memory cards are classified on basis of there cost, physical size, reading and writing speed, storage capacity. With such a long list of different flash memory card formats to choose from, it may be confusing to find the right memory card.
So before you go out to purchase a memory card, you need to confirm the format(s) supported by your digital devices prior to purchase. For example, your digital camera may only take an XD card (make sure by referring to the manufacturer of the digital device), do not go out and purchase an SD card. The Memory Stick, Memory Stick Pro and Memory Stick Duo are memory cards that work with only a few host devices, primarily with Sony brands.
Thesse memory cards are classified on basis of there cost, physical size, reading and writing speed, storage capacity. Given below is the classification given based on the above parameters:
SD, MMC, Compact Flash are cheaper than other memory cards but this is sole factor related to market. If for example we will consider Memory Stick Card, now all the rights related to these cards are with Sony. So they decide the price of this card for other companies like SanDisk want to manufacture them.
Compact Flash is the memory card which has the largest physical size, and XD, TransFlash, Mini-SD, RS-MMC are the smallest in case of physical size.
When your data is saved on the card the gadget or the appliance using it writes the data onto it. Now reading and writing speed are different for different memory cards.
Earlier 32MB and 16MB capacity cards were common, but now the capacity has increased to 16GB. Today you will not see 256MB or 512MB card also easily, 2GB cards are the most common. This is the needs of today. If we consider a basic digital camera with resolution of 4 Mega pixels then each snap taken will be of size 1.5-2MB. Now just think if you are using 32MB memory card, at the most you can store 16 photos in the card. Now imagine how many times you have to empty the memory card. So as the need increases the storage capacity of the memory cards also increases.
Some frequently asked questions :
Memory card does not recognized
Make sure the memory card is inserted into the device properly; if it is inserted properly but still not recognized by the host devices, it is possible that the memory card has become defective over time. Attempt to format the memory card; this could be done on the devices (digital camera, mp3 player) or on a computer.
Retrieve lost data from memory card
You can use hard disk repair programs (Norton Disk Doctor, Scandisk and Disk First Aid) to recover data fragments from the corrupted memory card. Additionally, there are third party programs and data recovery services. Typically, data cannot be recovered if the memory card is not recognized on a device.
Memory cards show less capacity than announced
There are two main reasons why there is a discrepancy between listed capacity of the memory card and what shows up on your computer. The most likely reason that your 512MB memory card shows up with only 485MB worth of capacity is due to the small discrepancies in algorithms and file formats by various operating systems. Also a portion of memory space is reserved for system files and data sectors for better memory card performance.
The second reason your card indicates less capacity on the device is due to capacity loss. When manufactured, some devices and card readers were not made to support higher capacity memory cards. An instance of this is 2 GB or higher capacity SD card that shows a memory capacity of 1 GB or less. It is always recommended that you research information on the device manufacturer to verify the correct supported format and capacity.
Video Game Memory devices.
1. Microsoft Xbox：
1) Detachable hard drives (20 GB, 60 GB, 120 GB or 250 GB)
2) Memory units
— Xbox: Memory Unit (8 MB)
— Xbox 360: Memory Unit (64 MB, 256 MB, and 512 MB versions)
3) USB Storage Devices
The Xbox 360 can read USB storage devices such as thumb drives, Microsoft Zune, Apple iPod (except iPod Touch and iPhone), mp3 players, PSPs, and hard drives, however an Optional Media Update is required to play music and other files from certain music players, this is available from the Xbox Live Marketplace.
— Wii/ GameCube: memory card, 59 block (4 Mbit/512 KB), 251 block (16 Mbit/2 MB), and 1019 block (64 Mbit/8 MB) versions
— NDS/ NDSi/ NDS Lite/ NDSi LL: SD/SDHC card (up to 32 GB)
3. Sony PlayStation line:
— PlayStation: Memory Card (1 Mb/128 KB divided in 15 blocks) (PlayStation Memory Card)
— PlayStation 2/ PS2: used 8MB cards for its own content and supported PlayStation Memory Cards for backward compatibility
— PlayStation 3/ PS3: integrated CompactFlash, Secure Digital, and Memory Stick PRO Duo support. External attachments allow the import and export of PlayStation and PlayStation 2 Memory Cards.
— PlayStation Portable/ PSP: Memory Stick PRO Duo
— PSP Go: Memory Stick Micro