What Does Sd Card Stand For

By | 22/10/2022

Memory cards accept a lot of specifications; Data Doctors’ Ken Colburn breaks them downwardly.



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Q: Can you help me empathise all the numbers on SD photographic camera cards?

Today’s memory cards comprise a confusing batch of geek speak, simply once you empathize some of the basics, it might make information technology easier to digest.

Physical size

Most of today’s devices use either SD or microSD cards, which you can determine by looking at the bill of fare slot on your camera.

Storage capacity

The easiest specification to digest is the storage capacity, which is represented in gigabytes, abbreviated every bit GB. It’s like shooting fish in a barrel to assume that the bigger the number, the amend, but this isn’t necessarily the case.

Not simply tin information technology be cheaper to apply multiple smaller cards, only then, you won’t alive and dice with just ane card — they practise degrade, get lost or feel data corruption.

SD vs. SDHC vs. SDXC

A memory bill of fare’southward chapters is determined past the file system being used to store data designated by the type of card.

  • SD
    (Secure Digital) cards are the oldest and least-used, and are limited to 2 GB of storage.
  • SDHC
    (High Capacity) cards tin can shop up to 32 GB of data.
  • SDXC
    (Extended Chapters) cards can store up to 2 Terabytes (2000 GB).

Older devices may non be able to use the SDXC format, then brand sure your device supports these larger cards before buying one.

Rated speed

This is where things can get a bit confusing, as various designations tin can refer to the bill of fare’due south speed. Information technology’due south represented in MB/s (megabytes per second), or a large number followed by an “ten” — or sometimes both.

The “ten” designation is a marketing term: 1x represents 150 kb/s, so 600x is the aforementioned as a 90 MB/s rating (600 x 150 = xc,000). This number typically represents the “read” speed, which is generally higher than the “write” speed.

Speed Course

This specification is represented on the card as a number inside of the letter of the alphabet “C.” It represents the minimum write speed and is well-nigh important to those shooting video or very large images in succession (burst mode).

There are iv classes: 2, 4, 6 and x. The number represents the minimum sustained megabytes per 2nd (MB/s) write speed — the higher the number, the faster the sustained speed.

UHS Speed Grade

Faster SDXC retentivity cards will accept the UHS rating, or Ultra High Speed, represented by a number inside the letter “U.” U1 means it’s 10 MB/southward; U3 means information technology’s rated at xxx MB/s.

UHS Coach Class

Different from the UHS Speed Grade, this rating refers to the “bus interface” and is represented by a roman numeral. Call back of the coach interface every bit the number of lanes on a freeway, while the UHS Speed Class represents the speed of individual cars.

Video Speed Class

If you’re trying to shoot extremely high-resolution video (four or 8K), this class of cards, designated by the letter V and a number that ranges from 6 to ninety, offers the fastest sustained write speeds.

Overkill vs. future-proofing

If you have older equipment that y’all plan on upgrading before long, getting a faster card than y’all currently need may make sense. Otherwise, don’t spend more money than you demand to — there’southward no performance benefit.

To assist you figure out what y’all actually need, check out SanDisk’due south spider web tool.  Once you figure out the specs for your desired menu, you can easily comparison-store around the internet.

Ken Colburn is founder and CEO of Data Doctors Computer Services. Ask any tech question on Facebook or Twitter.


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Source: https://wtop.com/tech/2018/02/an-explanation-of-sd-camera-cards/