Memory Cards Digital Camera
Digital Photo Storage Device
Conventional photography uses film as a storage medium and when one film is used up, you just take it out and
pop in a new roll. The roll of film is eventually developed and the stored images printed. Digital cameras also
have a form of removable digital photo storage called memory cards. The advantage of digital camera memory over
traditional roll film is that they can be erased and reused.
Images stored on a camera memory card can be transferred to a computer for additional processing and permanent
storage, or they can be transferred straight to a printer. Although a camera memory card is by far the preferred
storage medium on a digital camera, other media such as mini removable hard drives and optical disk storage are
Digital Camera Memory comes in a variety of sizes, so you need to decide how much storage space you are likely
to require for your photographs. However, several variables come into play when trying to figure the amount of
memory card storage needed. These include the mega-pixel rating of the camera, the format (JPEG or raw data) that
the images will be stored in and also the amount of compression used to store those images.
The most common form of image file compression is JPEG . However, in order to compress the image data and thus
make the file size smaller, some of the data that makes up your image is discarded and cannot be retrieved. This is
the reason that JPEG is termed a lossy format. In most instances, this loss of data is of no consequence to the
quality of the image. The savings in terms of storage space more than compensate for the discarded data. However,
in some circumstances the loss of any of the image data would not be acceptable so the image would have to be be
stored without any compression at all which requires quite a lot more storage space than with JPEG .
CompactFlash is a type of memory card that is most widely used for digital camera memory because of it's
availability and relatively low cost. Several digital camera manufacturers use CompactFlash as a standard means of
One of two different CompactFlash storage cards are used and these are termed Type 1 and Type 2. It is important to
know which type of CompactFlash card that the camera will accept as some cameras will work with one type but not
Secure Digital MultiMedia Card - SD MMC
Secure Digital MultiMedia Cards or SD MMC are the smallest of all of the memory cards. SD MMC are the same
except that SD cards possess a write-protect switch which prevents images from being accidentally erased. They can
be used in ultracompact cameras and also in personal entertainment devices such as MP3 players and the like. SD
-MMC cards have less maximum storage capacity than CompactFlash cards (currently at 1 GB) but still offer enough
space for most digital photography needs.
xD Picture Cards
xD Picture Cards were developed by Olympus and Fuji for their own range of digital cameras. However, they can be
used in other makes of camera by using a CompactFlash adaptor. The xD card is also very small measuring in at less
than 25mm (1 inch) square.
Memory Stick was developed by Sony and is used in nearly all Sony digital cameras. It can also be used in
additional Sony devices such as MP3 players and PDAs . Memory Sticks are used on very few other cameras beside Sony
cameras, so switching to another brand name will most likely mean being unable to use this type of memory.
A MicroDrive is an actual mini hard drive housed in a CompactFlash Type II casing. Being a mechanical drive that
contains moving parts, a MicroDrive is a lot more delicate than flash memory cards. They must be handled with
extreme care and are more prone to breakage. Again, because a MicroDrive is mechanical in operation it has slower
access time than CompactFlash cards, but has the advantage of a larger image storage capacity.