Is a high class microSD card worth the extra $
Im looking for a 16gb replacement for my 8gb stock card. Was about to buy a Sandisk from amazon but its a class 2. I found another thread with people comparing different class cards read and write speeds, but none of them said whether it translated into noticeable differences.
A class 2 card is as low as $21
A class 6 card is as low as $61
If Im not even going to NOTICE that difference outside of the SD card speed test app then I dont want to fork over an extra $40
- 10-30-2010, 10:45 AM #2
- 10-30-2010, 10:51 AM #3
- 10-30-2010, 12:05 PM #4
- 10-30-2010, 01:43 PM #5
- 10-30-2010, 02:41 PM #6
- 10-30-2010, 02:46 PM #7
well the 2GB mp4 movie plays beautifully on my EVO using the stock video player BUT fast forwarding capability is not good. it kicks me out of the movie when i try to use the scroll bar to fast forward. not sure if this is because the file is so big (2GB) or just a limitation of the video player - or both. no big deal for me because watching movies on EVO is more of a novelty for me and not something i would do often if ever. interesting test though.
- 10-30-2010, 03:29 PM #8
The higher class rating is only noticable for transfereing larger files. So yes to those who have 2 gig files, and yes to me who has 3 gigs of music.
General day to day use of the device no, but yes if you record in HD, technically the higher recording needs class 4. Class 2 is a bare minimum for HD recording. Again, just my opinion and only backed up by a few things i have read.
I am looking for a class 4 or 6 32G card because i do occasionally want to record in 720P and not get choppy recording or play back.
Also if i update my music it would be nice to have it go faster.
- 10-30-2010, 08:20 PM #9
- 10-31-2010, 01:59 AM #10
Also, whoever mentioned playback of a 2GB movie and fast forward crashing: no, that's just an issue of the app.
- 10-31-2010, 11:58 AM #11
There is another aspect to choosing your microsd card. That is battery consumption. Not going to go into details. There is only a finite amount of electricity a chip can consume before it overheats. So if a sd card is limited@ some speed it's because it takes more energy than what it can dissipate, to go faster. So if a sd chip is rated at 10 and you use it at 2 then you are using one fifth of the rated max current for the sd. Since all sd's are close in total consumption at their rated max, you do the math.
Please Google this and don't take my word for it.
- 10-31-2010, 02:34 PM #12
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- 11-01-2010, 12:50 AM #16
- 39 Posts
Easy guys. Willy900wonka is just saying that the max current usage is the same regardless of class number, i.e.:
Imax,class2 = Imax,class4 = .... = Imax
He is also assuming that the current consumption scales linearly with read speed, something like:
I,actual = Imax*(read speed/max read speed)
So if a movie only requires 1MB/s to read from the card, then a class 2 is at 50% power while a class 10 is at 10% power.
Is Willy Wonky? I don't know. I "googled it" but could not find the answer. I even looked on manufacturers web-sites.
Willy, please point us in the right direction.
- 11-01-2010, 01:08 AM #17
- 11-01-2010, 01:57 AM #18
- 11-01-2010, 04:40 AM #19
- 11-01-2010, 05:42 AM #20
The actual data I have is from design (spec) books (paper) distributed by mfgs. They should be available on line. Pick a chip by mfg. then google its design specifications.
A rhetorical question is why are low power sd's rated (when normalized to speed) and priced similarly to high speed sd's?
The other route is load the "currentwidget" from market, and run an sd dependent apk while using different sd's.
- 11-01-2010, 10:28 AM #21
I am 100% factually certain that Class 2 is enough. The math is not going to lie, seriously. I can record anything and play it back on my phone smoothly, on my stock SD card.
In addition! You are talking about READ speed, which SD cards are not rated for. If it plays correctly on your PC, then you automatically know the SD card was fast enough.
Finally, keep in mind that the EVO will drop frames when recording video in anything other than perfect lighting conditions. This is a camera issue, NOT an SD card issue. You could have a Class 10 card and it would still happen.
- 11-01-2010, 01:51 PM #22
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- 11-02-2010, 02:05 PM #23
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- 12-28-2010, 02:16 PM #25
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The class isn't going to have any effect on music playing. A class 2 is plenty fast enough for playing music - if it wasn't, all the stock users with class2 cards and gigs of MP3s on their EVO (myself included) would be screaming. You can put as much music as your card can hold.