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-   -   Class 4 MicroSD on N900? (https://talk.maemo.org/showthread.php?t=81867)

VulcanRidr 2012-01-25 16:26

Class 4 MicroSD on N900?
 
Does the N900 support class 4 cards? I bought a 32GB class 4 card, which I got last night. I copied everything over from my existing 16GB, swapped cards, charged the device.

Today, I have used it the way I normally do, listening to podcasts on the way to work (~1 hr), then it sitting on my belt. I pulled it out and noticed it was off. Tried to turn it on, and started coming up, then shut off. Plugged it in to the laptop, and it booted up, but the battery was dead.

Could the drain have been caused by the new card? Its the only change to my n900 between yesterday and today.

thanks,
--vr

GrimyHR 2012-01-25 16:42

Re: Class 4 MicroSD on N900?
 
Quote:

Originally Posted by VulcanRidr (Post 1155565)
Does the N900 support class 4 cards? I bought a 32GB class 4 card, which I got last night. I copied everything over from my existing 16GB, swapped cards, charged the device.

Today, I have used it the way I normally do, listening to podcasts on the way to work (~1 hr), then it sitting on my belt. I pulled it out and noticed it was off. Tried to turn it on, and started coming up, then shut off. Plugged it in to the laptop, and it booted up, but the battery was dead.

Could the drain have been caused by the new card? Its the only change to my n900 between yesterday and today.

thanks,
--vr

yes, any sdhc card(mine is class 10) should work, even sdxc

and no, battery drain shouldnt have been caused by an sd card, that is highly improbable, almost impossible...

ForeverYoung 2012-01-25 18:43

Re: Class 4 MicroSD on N900?
 
Maybe it's tracker-indexer consumed 100% cpu load, when it saw seveal Gb new (for it) files.

eight 2012-01-25 19:10

Re: Class 4 MicroSD on N900?
 
You can install cpumem-applet to have a quick view when cpu consumes 100%.

http://static.maemo.org/static/6/62d...umemapplet.png

A klick on Conky shows the top load processes.

http://static.maemo.org/static/4/4ac...ult_conky.conf

Advanced reasearch can be done with htop and powertop.
Tracker config is at: ~/.config/tracker/tracker.cfg
Gui-tool: http://maemo.org/packages/view/tracker-cfg/

http://my-maemo.com/grafika/tracker-cfg.jpg

VulcanRidr 2012-01-25 23:55

Re: Class 4 MicroSD on N900?
 
It could be, as ForeverYoung said, though I copied files last night and it had all night while plugged in to update the tracker...

This afternoon, I noticed is that I had used the slider to turn off the screen, and stuck it in my belt holster. when I pulled it out a few minutes later, the screen was on. And thinking back, I have had several occasions in which I turned on the screen, say to use FBreader and MediaBox was playing (generally with the FMTX on) after I thought I had paused it...So apparently, leaving media apps or even the desktop (where it was this afternoon) the screen lock is getting overridden?

Anyone seen this behavior? Know of a fix (or at least to identify the problem)?

Thanks,
--vr

VulcanRidr 2012-01-26 00:06

Re: Class 4 MicroSD on N900?
 
Update: I just pulled it out of the holster again, with FBreader as the primary app. The screen flashed on for about 1/2 second then back off. Something is definitely wonky with the screen lock.

Quote:

Originally Posted by VulcanRidr (Post 1155795)
It could be, as ForeverYoung said, though I copied files last night and it had all night while plugged in to update the tracker...

This afternoon, I noticed is that I had used the slider to turn off the screen, and stuck it in my belt holster. when I pulled it out a few minutes later, the screen was on. And thinking back, I have had several occasions in which I turned on the screen, say to use FBreader and MediaBox was playing (generally with the FMTX on) after I thought I had paused it...So apparently, leaving media apps or even the desktop (where it was this afternoon) the screen lock is getting overridden?

Anyone seen this behavior? Know of a fix (or at least to identify the problem)?

Thanks,
--vr


Helmuth 2012-01-26 12:45

Re: Class 4 MicroSD on N900?
 
Just a note, I'm using this Class 10 32GB SDHC card without any problems: PATRIOT 32GB microSDHC Karte Class 10
(despite the fact the tracker needs very long to index the whole 64GB storage)

Estel 2012-01-26 12:59

Re: Class 4 MicroSD on N900?
 
Also just a note - good class 4 card is best choice for N900 - much better than class 6 and class 10. The latter (6 and 10) have faster bulk write/read speeds, but much lower random access/write and small parts handling. As a result, class 4 card makes device fly with swap set on it (and disabled on eMMC).

Of course, all this "class" thing is very arbitrary (no true standards), that's why I've said "good". Sandisk is known for great class 4 cards.

Personally, I'm using class 2 card (yet, using swap on it exclusively, still makes device fly), but in case of upgrade, I'm definitely going to use class 4 card.

/Estel

eight 2012-01-26 14:40

Re: Class 4 MicroSD on N900?
 
I did some bechmarks of three different SDHC Cards in an USB-Reader.
In this case the 4 Gig card performs bad at short read/write cycles. If you're lucky a class 2 card performs like class 10 at big files (saw that in benchmarks) or as bad as this one.
My personal usage of the SDcard is only for Backups, Images, Music, and Films/Video, so my next one will be a 32 GB Samsung Class 10 which reaches up to 20 MB/s.

Post your benchmarks.


4Gb class 4
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/vvgojm4swp8s.png

http://www7.pic-upload.de/26.01.12/vwzox55ih1so.png


8 Gb class 2
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/pmo84ektg38g.png

http://www7.pic-upload.de/26.01.12/bym762wfdcz.png


16Gb class 10
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/q6vr9fd8owwi.png

http://www7.pic-upload.de/26.01.12/p8dztshl9uo.png

--------------------------------------------------------------------------------


16 GB Samsung class 10 benchmark from another forum:
amazon
http://www7.pic-upload.de/26.01.12/zgqeb9jqft9.png
http://www.android-hilfe.de/attachme...3-u8510-sd.png

vi_ 2012-01-26 15:15

Re: Class 4 MicroSD on N900?
 
Quote:

Originally Posted by eight (Post 1156050)
I did some bechmarks of three different SDHC Cards in an USB-Reader.
In this case the 4 Gig card performs bad at short read/write cycles. If you're lucky a class 2 card performs like class 10 at big files (saw that in benchmarks) or as bad as this one.
My personal usage of the SDcard is only for Backups, Images, Music, and Films/Video, so my next one will be a 32 GB Samsung Class 10 which reaches up to 20 MB/s.

Post your benchmarks.


4Gb class 4
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/vvgojm4swp8s.png

http://www7.pic-upload.de/26.01.12/vwzox55ih1so.png


8 Gb class 2
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/pmo84ektg38g.png

http://www7.pic-upload.de/26.01.12/bym762wfdcz.png


16Gb class 10
--------------------------------------------------------------------------------

http://www7.pic-upload.de/26.01.12/q6vr9fd8owwi.png

http://www7.pic-upload.de/26.01.12/p8dztshl9uo.png

--------------------------------------------------------------------------------


16 GB Samsung class 10 benchmark from another forum:
amazon
http://www7.pic-upload.de/26.01.12/zgqeb9jqft9.png
http://www.android-hilfe.de/attachme...3-u8510-sd.png

Wow, that samsung card is a beast! Is it REALLY writing 8KB blocks at ~9MB a second?? That is **** your pants fast.


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