Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Forums  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear
Guest
Forums  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear
Register to forums    Log in

 
FORUMS Cameras, Lenses & Accessories Canon Accessories 
Thread started 06 May 2012 (Sunday) 15:10
Search threadPrev/next
sponsored links (only for non-logged)

Different classes of memory cards question

 
Shutterwolf
Senior Member
Avatar
523 posts
Joined Apr 2012
Location: California
     
May 06, 2012 15:10 |  #1
bannedPermanent ban

I have seen Class 4, Class 10, and others, but what does it mean? Is that build quality or something?

Also, for a 60D, what is the best memory card I can get for under 60 bucks? Best size/speed/durability. I want to get into shooting RAW format pictures with this camera since I mostly did JPG on the Xti due to space limitation on the card. My good card (extreme IV) was only a 2gb, and I hated using the 8gb because it was really slow (133x)

Also this brings up another question... what is the "x" for? I really only understand Mb/s... Why do we need to have an "x" speed as well, whatever "x" is.


Josh
https://www.facebook.c​om/ShutterwolfPhotogra​phy (external link)
60D, 550EX, Canon EF 50mm f/1.8 Mark II, Canon 28-135mm IS, 18-55(old), Rebel Xti/400D (for sale)

  
  LOG IN TO REPLY
Persephone
Goldmember
Avatar
1,122 posts
Joined May 2008
Location: CA
     
May 06, 2012 16:54 |  #2

Per Market Watch: http://www.buydig.com …uct.aspx?sku=SD​SDU064GA11 (external link) 64GB SD card for $57. You'll probably never run out of space there.


Gear list
"Do you think it was my choice to wed a man I did not love? Live a life I did not choose? I was betrayed by the very gods that once saw me as their own. But no more." - Περσεφόνη (external link), God of War

  
  LOG IN TO REPLY
hollis_f
Cream of the Crop
Avatar
10,649 posts
Gallery: 1 photo
Likes: 85
Joined Jul 2007
Location: Sussex, UK
     
May 07, 2012 04:30 |  #3

Shutterwolf wrote in post #14388753 (external link)
I have seen Class 4, Class 10, and others, but what does it mean? Is that build quality or something?

The 'Class' classification for SD cards refers to their minimum speed. So a Class 10 is guaranteed to do at least 10 MB/s. It's a bit of a stupid system, because Class 10 is the fastest, despite the fact that current SD cards are way faster than 10 MB/s.

Shutterwolf wrote in post #14388753 (external link)
Also this brings up another question... what is the "x" for? I really only understand Mb/s... Why do we need to have an "x" speed as well, whatever "x" is.

The 'x' classification was brought in because marketing droids decided that users wouldn't be able to understand MB/s as a speed rating. (Note it's MB/s not Mb/s - the former is MegaBytes per second, the latter is Megabits per second; that's 8 times slower. Mb/s is commonly used when talking about data transfer rates, so it really is important to use the right one).

In the olden times CD writers could write at an incredible 150 kB/s. Then faster drives were introduced and the 'x' labelling started. 300 kB/s drives were 2x, 600 kB/s drives were 4x; etc., etc. And the same system started getting used for memory cards. So your 400x card will be able to do 60 MB/s.


Frank Hollis - Retired mass spectroscopist
Give a man a fish and he'll eat for a day. Teach a man to fish and he'll complain about the withdrawal of his free fish entitlement.
Gear Website (external link)

  
  LOG IN TO REPLY
Shutterwolf
THREAD ­ STARTER
Senior Member
Avatar
523 posts
Joined Apr 2012
Location: California
     
May 07, 2012 06:02 |  #4
bannedPermanent ban

hollis_f wrote in post #14391684 (external link)
The 'Class' classification for SD cards refers to their minimum speed. So a Class 10 is guaranteed to do at least 10 MB/s. It's a bit of a stupid system, because Class 10 is the fastest, despite the fact that current SD cards are way faster than 10 MB/s.

The 'x' classification was brought in because marketing droids decided that users wouldn't be able to understand MB/s as a speed rating. (Note it's MB/s not Mb/s - the former is MegaBytes per second, the latter is Megabits per second; that's 8 times slower. Mb/s is commonly used when talking about data transfer rates, so it really is important to use the right one).

In the olden times CD writers could write at an incredible 150 kB/s. Then faster drives were introduced and the 'x' labelling started. 300 kB/s drives were 2x, 600 kB/s drives were 4x; etc., etc. And the same system started getting used for memory cards. So your 400x card will be able to do 60 MB/s.

Ahh ok cool, thanks for the info!


Josh
https://www.facebook.c​om/ShutterwolfPhotogra​phy (external link)
60D, 550EX, Canon EF 50mm f/1.8 Mark II, Canon 28-135mm IS, 18-55(old), Rebel Xti/400D (for sale)

  
  LOG IN TO REPLY
Jon
Cream of the Crop
Avatar
69,628 posts
Likes: 227
Joined Jun 2004
Location: Bethesda, MD USA
     
May 07, 2012 08:49 |  #5

Actually, the "Class" system is supposed to represent the minimum sustained write speed under somewhat-standardized conditions. The "x" rating frequently reports the burst speed. And it's important to note that some vendors measure the burst rate under highly idealized conditions, and will quote the faster read speed just to get better sounding numbers.


Jon
----------
Cocker Spaniels
Maryland and Virginia activities
Image Posting Rules and Image Posting FAQ
Report SPAM, Don't Answer It! (link)
PERSONAL MESSAGING REGARDING SELLING OR BUYING ITEMS WITH MEMBERS WHO HAVE NO POSTS IN FORUMS AND/OR WHO YOU DO NOT KNOW FROM FORUMS IS HEREBY DECLARED STRICTLY STUPID AND YOU WILL GET BURNED.
PAYPAL GIFT NO LONGER ALLOWED HERE

  
  LOG IN TO REPLY
sponsored links (only for non-logged)

1,356 views & 0 likes for this thread, 4 members have posted to it.
Different classes of memory cards question
FORUMS Cameras, Lenses & Accessories Canon Accessories 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Forums   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset   •  Home

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.58forum software
version 2.58 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Dave_M_Photo
1045 guests, 140 members online
Simultaneous users record so far is 15,144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.