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Bundyo is offline Bundyo
2009-11-25 , 06:12
Posts: 4,708 | Thanked: 4,649 times | Joined on Oct 2007 @ Bulgaria
#21
The class of a SDHC card means minimum write speed based on "the best fragmented state where no memory unit is occupied". Try also with many small files for instance.
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juanenrique is offline juanenrique
2009-11-25 , 07:25
Posts: 115 | Thanked: 114 times | Joined on Nov 2009 @ | MAD | MEX | MOW |
#22
guys, now that you're on this subject, i have a noob question... is there any substantial difference of battery use if the microSD is class 2 or 6?
 

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czajunia is offline czajunia
2010-11-05 , 01:49
Posts: 25 | Thanked: 3 times | Joined on Sep 2010
#23
There's an article comparing Class 2 and Class 6 cards here:
http://thenokiaguide.com/2010/10/15/...-16gb-class-6/

Class 6 card is clearly faster when copying files to/from a computer using USB. Does it actually reflect the way N900 accesses a memory card or is it irrelevant here?

I know that this question has already been asked but I don't think it has been answered - I was wondering if it makes any sense buying Class 6 or 10 cards for N900? Does anyone know what is the maximum speed N900 can read/write from/to a memory card?
 

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SAABoy is offline SAABoy
2010-11-05 , 02:22
Posts: 604 | Thanked: 108 times | Joined on Feb 2010 @ Phoenix, WA
#24
Originally Posted by czajunia View Post
There's an article comparing Class 2 and Class 6 cards here:
http://thenokiaguide.com/2010/10/15/...-16gb-class-6/

Class 6 card is clearly faster when copying files to/from a computer using USB. Does it actually reflect the way N900 accesses a memory card or is it irrelevant here?

I know that this question has already been asked but I don't think it has been answered - I was wondering if it makes any sense buying Class 6 or 10 cards for N900? Does anyone know what is the maximum speed N900 can read/write from/to a memory card?
x2, this is an excellent question.
 
xtreemneo is offline xtreemneo
2010-11-05 , 04:11
Posts: 79 | Thanked: 2 times | Joined on Apr 2010 @ Pandora
#25
how do i find Class of my card.. Which am holding it right not with out reading its package.. Which i have dumped it years ago
 
egoshin is offline egoshin
2010-11-05 , 04:41
Posts: 992 | Thanked: 995 times | Joined on Dec 2009 @ California
#26
Originally Posted by czajunia View Post
There's an article comparing Class 2 and Class 6 cards here:
http://thenokiaguide.com/2010/10/15/...-16gb-class-6/

Class 6 card is clearly faster when copying files to/from a computer using USB. Does it actually reflect the way N900 accesses a memory card or is it irrelevant here?

I know that this question has already been asked but I don't think it has been answered - I was wondering if it makes any sense buying Class 6 or 10 cards for N900? Does anyone know what is the maximum speed N900 can read/write from/to a memory card?
Yes, it does. You can look into my measurement here - http://talk.maemo.org/showpost.php?p...0&postcount=91
 

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kureyon is offline kureyon
2010-11-05 , 07:07
Posts: 992 | Thanked: 738 times | Joined on Jun 2010 @ Low Earth Orbit
#27
You can keep an eye on this thread and see whether more people post their results:

MicroSD benchmark
 
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edgar2 is offline edgar2
2010-11-05 , 08:12
Moderator | Posts: 199 | Thanked: 264 times | Joined on May 2009 @ turku, finland
#28
Originally Posted by czajunia View Post
I was wondering if it makes any sense buying Class 6 or 10 cards for N900? Does anyone know what is the maximum speed N900 can read/write from/to a memory card?
cpitchford [discussions.nokia.co.uk]:
the microSDHC cards still a bottleneck generally, even the class 10 (although he quotes only class 4 numbers).
class 10 benchmarks by JayBEE [tmo]:
Patriot Class 10 8GB
Read: 14.0621 MB/s
Write: 11.4785 MB/s
comment by aligatro re Meego 1.1:
It lagged like hell on class 6 card.
but a real-world comparison between class 6 and class 10 on n900 running meego; couldn't find one. if the primary use case is dual booting meego, then choosing between, for example, verbatim 4gb class 6 at 11€ and kingston 16gb class 10 at 80€ is not that easy.
Last edited by edgar2; 2010-11-05 at 08:22.
 
czajunia is offline czajunia
2010-11-05 , 10:33
Posts: 25 | Thanked: 3 times | Joined on Sep 2010
#29
Originally Posted by edgar2 View Post
if the primary use case is dual booting meego, then choosing between, for example, verbatim 4gb class 6 at 11€ and kingston 16gb class 10 at 80€ is not that easy.
The choices like that are never easy I believe the sweet spot for Class 6 micro sd cards is 8gb at the moment as they go for around £12-14 in UK. Whether they perform better than this:
My result
SanDisc Class2 16GB
Read: 14.5952 MB/s
Write: 8.53831 MB/s
that's a completely different story.

(NOTE: they are not my results - it was copied from the benchmark thread). Thanks for the links guys!
Last edited by czajunia; 2010-11-05 at 11:11.
 
shadowjk is offline shadowjk
2010-11-05 , 13:03
Posts: 1,258 | Thanked: 672 times | Joined on Mar 2009
#30
Class rating and these benchmarks test the single stream sequential write and read speed. In real life, access patterns are more random. It's theoretically entirely possible that a class 4 card could slow down to 1M/s and a class 10 card could slow down to 0.1M/s, depending on how they're designed and built, which would result in the class 4 feeling faster in MeeGo.

Generally higher class rating does mean faster speed under most loads, but you shouldn't be surprised when you find exceptions.

For digital camera use, the class rating is the most useful, because it's the access pattern of a dedicated purpose-built camera that the class rating targets.
 
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