So what do you need to know before buy the memory card :
Type of memory card
There are few type of memory card for your information that are available on the market :
SD Memory Card
- First integration of secure digital memory card.
- Release in 1999
- provide up to 2 gb storage.
SDHC Memory Card
- Second iteration of secure digital memory cards - HC meaning high capacity
- Released in 2006
- Provides up to 64GB of storage
- Offers increased speeds
- Third iteration of secure digital memory cards - XC meaning eXtended capacity
- Released in 2009
- Provides up to 2TB of storage
- Offers increased speeds- up to 300MB/s
- First iteration of the micro format
- Released in 2005
- Provides up to 2GB of storage
- 80% smaller than regular SD memory cards
- Second iteration of the micro format
- Released in 2007
- Provides up to 32GB of storage
- 80% smaller than regular SD memory cards
- Offers increased speeds over microSD
Eye-Fi cards are a unique type of SD card with Wi-Fi built right into the SD memory card. Eye-Fi allows your photos and videos to be immediately uploaded over the wifi network instantly clearing up space on the memory card for limitless shooting. You can upload not only to your computer but if you're on the road they can be uploaded to your favorite online service, including flickr, facebook, snapfish, youtube, picasa, etc. Eye-Fi provides a free hotspot access service internationally for eye-fi owners and also permit you to easily add Wi-Fi networks you have access to. Finally some Eye-Fi cards can utilize the wireless signals to do geolocation allowing it to geo tag your photos similar to a GPS (although less accurate but available indoors where GPS is not).
Compact flash, introduced in 1994, was one of the first memory card type for 16 years provided the highest level of storage and fastest transfer rates despite introductions by many competing formats. Due to its large 128GB maximum storage capacity and fast speeds compact flash has remained popular in professional digital SLRs. Secure digital has long since replaced compact flash in smaller cameras, entry level and increasingly in semi-pro SLRs. The SDXC format provides higher theoretical storage and transfer capabilities to compact flash and will finally provide an alternative storage format for pro photography cameras.
- Extremely high transfer rates - 90MB/s in available cards
- Large capacities
- Many photographer like the larger size - easier to handle, harder to loose
- Most pro SLRs require compact flash
- Some feel compact flash is more durable
The MultiMediaCard also known as MMC, is not a currently supported standard the last revision of the standard was in 2005 and most cameras do not accept MMC formats. MMC provides a maximum of 4GB of storage.
SD cards are also available in various speeds. If you're using a point-and-shoot digital camera or a standard-definition pocket camcorder, speed class won't matter much. If you're shooting high-resolution RAW photos with a digital SLR, however, you need a quick card to take more than two or three shots at a time. SD cards are generally described by their Speed Class, ranging from Class 2 (slowest) to Class 10 (fastest). There's also a separate, even faster category called UHS Class 1 (for Ultra High Speed), but most current devices can't use them.
While the SD Association (the group that defines SD card technology) doesn't release exact speed standards for card classes to non-members, it does offer loose guidelines for which classes are acceptable various uses. Class 2 is suitable for standard-definition video recording, while Class 4 and Class 6 can record high-definition video. Class 10 is the card for HD video and "HD still consecutive recording," which, like the classes' speeds, is ill-defined. The various card classes seem to have different speed ranges according to different memory manufacturers. According to Sandisk, for example, Class 4 cards offer read and write speeds of 15 megabytes per second (MBps), Class 6 cards can handle 20MBps, and Class 10 cards reach 30MBps. Kingston, on the other hand, describes its Class 4 cards as delivering a 4MBps data transfer rate, Class 6 as having 15MBps write speed, and Class 10 offering a 40MBps data transfer rate. According to Sandisk, UHS-1 SD cards can transfer up to 45MBps, and according to the SD Association, the maximum transfer speed based on the interface bus used is 310MBps (though this limit won't be reached by cards for a long time, likely after several faster UHS speed classes are defined).
Generally, if you want to shoot HD video or if you plan on taking a lot of high-resolution photos in quick succession (or use a digital SLR's RAW image file format), buy a Class 10 card. If you're planning to just take snapshots or occasionally show videos, Class 4 or Class 6 will do. Since even smartphones can record HD video these days, Class 2 cards aren't the best choice. They're simply too slow to record HD video, so you're limiting your device's features. The price difference between Class 4, Class 6, and Class 10 cards can vary, but not vastly. At the time of this writing, on Newegg.com, 32GB SDHC cards made by Kingston Technology were available in Class 4 for $54, Class 6 for $66, and $73 for Class 10. UHS-1 cards are much, much more expensive than the other cards; Kingston was offering a 32 GB UHS-1 SD card for $293, and that was on sale. Unless you're a professional who needs absolute certainty in speed when dealing with very large images or high-bitrate video, you don't need UHS-1. In fact, unless you have professional or semi-professional equipment, you probably won't even be able to use these cards. Always check your device's documentation for support information before you commit to a memory card.
Card speed is often stated in ‘Times’ speed (8X, 20X etc.) and sometimes, more specifically, in Megabyte per second - reflecting the card’s per-second ability to have data transferred from or to it:
Card speed is often stated in ‘Times’ speed (8X, 20X etc.) and sometimes, more specifically, in Megabyte per second - reflecting the card’s per-second ability to have data transferred from or to it:
| Speed | Class | Transfer Rate |
| 8X | 1.2 Mb/sec | |
| 12X | 1.8 Mb/sec | |
| 20X | Class 2 | 2.0 Mb/sec |
| 25X | 3.8 Mb/sec | |
| 30X | Class 4 | 4.0 Mb/sec |
| 40X | Class 6 | 6.0 Mb/sec |
| 60X | 9.0 Mb/sec | |
| 66X | Class 10 | 10.0 Mb/sec |
| 80X | 12.0 Mb/sec | |
| 133x | 20.0 Mb/sec | |
| 266x | 40.0 Mb/sec | |
| 300x | 45.0 Mb/sec |
P.S. – If You have Found this post Helpful, I will appreciate if you can Share it on Facebook, Twitter and Other Social Media Sites.
0 comments:
Post a Comment