Develop Bugs

[Q] microSDHC speeds - Advice

Hi,
I've been following the discussion on faster IO here by mounting extra stuff back on the SD card. I believe that to take advantage of this a faster microSDHC card can only help.
My card is a SanDisc 16GB Class 2 job, I just transferred it from my old N97 mini.
Looking around I noticed that generally the fastest is a class 6 although Kingston now seem to produce a class 10.
Of course Class increase == $$ increase.
I noticed that one site mentioned low speeds with a class 6 when using a benchmark tool, SD Card Speed Tester from the market.
Of course I just had to download it and see what my lowly class 2 card would do.
B***dy H*ll it exceeded class 6 cards and achieved:
Write Speed is 9MB/s
Read Speed is 15MB/s
Screen shot attached.
So my question is, how likely is it that it really is a fast card or just that the BM tool got it wrong ?

the "class" mentioned is actually the minimum r/w speed rated for the card, and branded cards often have speeds exceeding the rated class easily, so yeah, it is a fast card, no doubt

Thanks,
This was a "bounce my thoughts" type of question. You've confirmed my thoughts.
Just as a sanity check I later tried my other class 2 card, a 4GB job that came with the phone. It was 3-4MB/s write. That improved my confidence that the SD speed app was producing reasonable results.

better 32GB MicroSDHC than Sandisk

Anyone know of a better 32GB MicroSD card than the Sandisk? It's only class 2, but its random write performance is leaps and bounds better than both the Kingston and the Patriot LX, which helps to prevent severe lag when using apps2sdext.
I had hope a class 10 Patriot would at least be as good, but the results couldn't have been more different. Ideally I would like more sequential write speed without having to sacrifice random write performance.

We have been using/ Distributing microSD Class 10 cards from Wintec. I am using there 16 GB Class 10 on a Samsung Captivate. If you could direct me to a Android test program you like, I would be glad to run it. I have had no problems since switching.

but sandisk is the best around! for the price.....

nokia or kingstone but i prefer sandisk for the price

i have a sandisk and the card is great

I have never found anything better or more reliable than Sandisk. No bells and whistles just solid performance.

i need this type of card

but with model to choose

The OCZ branded cards are good in my experience.

Lexar's apparently got some top-notch class-10 32giggers out...
You can order them straight from their website (they might be a little backlogged though).

Class 2 and 4 cards have better random access speed and random read/write than class 6 or 10 cards in general. To get higher sequential write speeds, manufacturers sacrifice the random access speeds. That's just how it is.
The best all around card I've ever found is Sandisk class 4.
My 32gb Sandisk class 4 outperforms any other class 10 or 2 32gb card I've tested in the random access and random read/write speeds. That's what's most important when using with WP7 or Android when using it for apps or OS files that need to be accessed quickly. Class 6 and 10 cards are setup to initialize the area of the card that is about to be used to make the sequential write/read quicker, but it takes extra time in the beginning to do the initialization. If your using the card where you need to access small bits of info from various parts of card quickly, you will do best with class 2 or 4.
Most people seem to assume that the higher the class, the better the card is for everything, but that's not how it is. Different purposes need different kinds of speed... cards with higher sequential speeds have lower random speeds.

zarathustrax...it seems to be a hot topic. after all, repetition is the best way to learn

Will Scripts Improve random access speeds?
zarathustrax said:
Class 2 and 4 cards have better random access speed and random read/write than class 6 or 10 cards in general. To get higher sequential write speeds, manufacturers sacrifice the random access speeds. That's just how it is.
The best all around card I've ever found is Sandisk class 4.
My 32gb Sandisk class 4 outperforms any other class 10 or 2 32gb card I've tested in the random access and random read/write speeds. That's what's most important when using with WP7 or Android when using it for apps or OS files that need to be accessed quickly. Class 6 and 10 cards are setup to initialize the area of the card that is about to be used to make the sequential write/read quicker, but it takes extra time in the beginning to do the initialization. If your using the card where you need to access small bits of info from various parts of card quickly, you will do best with class 2 or 4.
Most people seem to assume that the higher the class, the better the card is for everything, but that's not how it is. Different purposes need different kinds of speed... cards with higher sequential speeds have lower random speeds.
Click to expand...
Click to collapse
Noob question: recently, scripts have been produced to, for example, speed the reading of photos in the gallery. Will those same scripts improve the class 10 cards such that their performance is better than class 4 cards?

Ashyford said:
Noob question: recently, scripts have been produced to, for example, speed the reading of photos in the gallery. Will those same scripts improve the class 10 cards such that their performance is better than class 4 cards?
Click to expand...
Click to collapse
They may improve speeds a little in your phone, but it doesn't change how the sd cards controller acts. So no, it won't make class 10 have better random speeds and access times than a high quality class 2 or 4. The controller in the SD card and the actual NAND memory chip itself decides how the card reads and writes and the speeds it has.

andisk is the best

i want to know too . . . .

Class10 SDcards the source of lag in ICS?

Hey gang,
This was a post from n2locarz that I found interesting and I wanted to post it in this forum
I personally have no education on the subject.
Talk amongst yourselves :fingers-crossed:
n2locarz said:
Hey guys, found this interesting article on slashdot about the "lag" of Android ICS. Looks like it may be a bigger issue than just our Inc2s. Anyway, read it over.
http://news.slashdot.org/story/13/01/12/1332204/the-android-lag-fix-that-really-wasnt
There is one comment I found very interesting. They are talking about faster "class 10" sd cards being better, which may not be the case:
This is a common misconception. The class of the SD card is a rating for sequential write speed, nothing more. It's important for cameras and camcorders - in fact it was developed for camcorders because some memory cards simply couldn't write the video data as quickly as the device was sending it to the card.
For an Android device you're more interested in its 4k random read/write performance. It's basically a computer reading/writing lots of small files, so it'll be most impacted by 4k read/write speeds.
As it turns out, manufacturers can tune a flash card for a certain type of performance. If you tune it for faster sequential speeds, random speeds suffer. Likewise if you tune it for random speed, sequential speeds suffer. The class 10 cards I've benchmarked typically hit 10-20 MB/s on sequential writes, but will bog down to as slow as 0.004 MB/s on random writes (yes, 4 kB/s - it was the card I bought before I learned all this. It took 4 hours to copy 4 GB of sheet music and MP3s to that class 10 card - a blissful 0.28 MB/s). Here are the CrystalDiskMark scores I got for a 32 GB class 4 card I have:
seq: 22.9 MB/s read, 4.3 MB/s write
512k: 22.0 MB/s read, 1.3 MB/s write
4k: 3.3 MB/s read, 1.3 MB/s write
Yikes! Only 4.3 MB/s write speed. Who would ever want that? Well look at the benchmarks for a 16 GB class 10 card I have:
seq: 21.8 MB/s read, 12.0 MB/s write
512k: 21.5 MB/s read, 0.9 MB/s write
4k: 5.7 MB/s read, 0.008 MB/s write (not a typo)
So yeah it's 3x faster at sequential writes. But it's slower at 512k writes, and more than 160x slower at 4k writes. It's definitely a very bad choice for an Android device despite being class 10.
The sweet spot for Android is around class 4 or 6. That gets you good 4k write speeds without punishingly poor sequential write speeds (which are important if you're doing something like copying a movie to the card). That said, not all cards are created equal. The "class 2" Samsung card which came with my phone is hands down the best card I've tested overall. It peaked at 11 MB/s sequential writes (meaning it could've been rated class 10), while 4k random writes were still above 1 MB/s. Sandisk is another company which seems to underrate their cards (and their class 10 cards have better if not stellar 4k random write speeds), which is why they're usually highly recommended for Android devices.
tl;dr - You want a class 4 or 6 card, or a good class 2 card for your Android device. Not a class 10 card.
Click to expand...
Click to collapse

CalvinAMi said:
Hey gang,
This was a post from n2locarz that I found interesting and I wanted to post it in this forum
I personally have no education on the subject.
Talk amongst yourselves :fingers-crossed:
Click to expand...
Click to collapse
I don't have a class 10 and I still got the lag while using CM10. After 5+ times of getting it, wiping, and reflashing back to CM10 I finally gave up and am now back on Venom for the first time since ~1.0.

[Q] Which SD card to buy?

To the Community:
I use one of these puppies:
http://dx.com/p/sd-to-microsd-transflash-card-converter-module-27001#.UvLz3PldWSo
so I'm in the market for a 128gb SD card.
I've searched but cannot find the theoretical maxima for read / write speeds for the GN10.1-2014 and I don't wanna buy too much card for the hardware.
I'm contemplating the Lexar Pro or the SanDisk Extreme Plus.
Any recommendations?
Thanks in advance everybody...

SanDisk has proven to be reliable and fast SD card. At least for the 64GB model.
Sent from my SM-P605 using Tapatalk

whatllitbenext said:
To the Community:
I use one of these puppies:
http://dx.com/p/sd-to-microsd-transflash-card-converter-module-27001#.UvLz3PldWSo
so I'm in the market for a 128gb SD card.
I've searched but cannot find the theoretical maxima for read / write speeds for the GN10.1-2014 and I don't wanna buy too much card for the hardware.
I'm contemplating the Lexar Pro or the SanDisk Extreme Plus.
Any recommendations?
Thanks in advance everybody...
Click to expand...
Click to collapse
Hello whatllitbenext,
here are benchmark results for the internal flash memory. Taken from http://www.notebookcheck.com/Test-Samsung-Galaxy-Note-10-1-2014-Edition-Tablet.105624.0.html
AndroBench 3
Sequential Read 256KB
103.96 MB/s
Sequential Write 256KB
22.35 MB/s
Random Read 4KB
15.97 MB/s
Random Write 4KB
2.09 MB/s
best regards
Getrid …

Getrid said:
Hello whatllitbenext,
here are benchmark results for the internal flash memory. Taken from http://www.notebookcheck.com/Test-Samsung-Galaxy-Note-10-1-2014-Edition-Tablet.105624.0.html
AndroBench 3
Sequential Read 256KB
103.96 MB/s
Sequential Write 256KB
22.35 MB/s
Random Read 4KB
15.97 MB/s
Random Write 4KB
2.09 MB/s
best regards
Getrid …
Click to expand...
Click to collapse
Thanks Getrid.
What about to the external SD card? Is a 90mb/sec. read, 45 mb/sec. write SD card overkill?

whatllitbenext said:
Thanks Getrid.
What about to the external SD card? Is a 90mb/sec. read, 45 mb/sec. write SD card overkill?
Click to expand...
Click to collapse
Depends on how you want to use your tablet. If mainly for (HD) video recording/watching movies a fast card with high sequential r/w stats would be my first choice.
On the other hand, my experience from using my HTC HD2 with multiple OS booting from SD tells me, that sequential r/w speed doesn't matter when dealing with a lot of smaller data sizes, like from apps. In that case decent random r/w stats, (random) access time and also IOPS/sec come largely into effect - that is a class 10 card won't pay off and you should better watch out for a, for example, class 4 or 6 card from Sandisk.
You may also have a look at this very interesting thread:
http://forum.xda-developers.com/showthread.php?t=1947560
Kindest regards
Getrid …

SDcards.

Hey guys. So whats the best SD for the 10? Looks like the SanDisk Extreme PRO SD UHS-II is the fastest card available at the moment. Anyone using it and is there a noticable difference in phone storage speed vs the sdcard speed?

This is the one I was looking at. http://www.bhphotovideo.com/c/produ...qxpj_128g_ancm3_128gb_extreme_pro_uhs_ii.html
OR maybe the 64gb version
http://www.bhphotovideo.com/c/produ...sqxpj_064g_ancm3_64gb_extreme_pro_uhs_ii.html

I'm using the SanDisk Extreme Pro 32gb. Honestly, I can't tell much difference between it and my Samsung EVO+ Card

I'm using the 200gb Sandisk Extreme Pro. It's not the fastest, but I actually just cared more about capacity. Have it setup as my adoptable storage at the moment.

FYI, Amazon is selling Sony 128GB Class 10 UHS-1 MicroSD cards for ~$33. Link. 64GB is ~$23.

The fastest one you can get, that the 10 can actually take advantage of is the Sandisk Extreme Pro 64gb UHS1 - U3.
http://www.amazon.com/SanDisk-Extre...894646&sr=8-2&keywords=sandisk+extreme+pro+u3
The snapdragon 820 does not support UHS2 cards, so that would just be wasted money.

I'm using this one and the overall reviews are mixed but I get write speeds of 77 Mbps and reads at 89 Mbps but its relatively cheap for a 64 gig U3 card
http://www.amazon.com/PNY-Elite-Mic...346&sr=8-2&keywords=pny+elite#customerReviews

Larger capacity cards will be slower. 64GB may be best bang for buck if you are looking for performance. I preferred capacity as well as speed, and hence got:
http://www.amazon.com/Lexar-Professional-microSDXC-UHS-II-LSDMI128CBNL1000R/dp/B00U77V5KU
I have been happy with its performance.

regalpimpin said:
The fastest one you can get, that the 10 can actually take advantage of is the Sandisk Extreme Pro 64gb UHS1 - U3.
http://www.amazon.com/SanDisk-Extre...894646&sr=8-2&keywords=sandisk+extreme+pro+u3
The snapdragon 820 does not support UHS2 cards, so that would just be wasted money.
Click to expand...
Click to collapse
Oh that's great info! I didn't know that the 10 didn't support the UHS2 cards.
Sent from my HTC 10 using XDA-Developers mobile app

There will be a 265GB micro sd card from Samsung - Samsung EVO Plus 256GB .

I don't buy anything from Samsung as I have had horrible luck with their products. Had a 64GB a year ago that went bad. Personal experience/preference...
I am using the Sandisk 200GB, if you watch Amazon they run sales on them. I got mine in mid-march for $59.99.

128gb sandisk extreme on sale now at amazon... https://www.amazon.co.uk/dp/B01DYN4VPE/ref=cm_sw_r_other_apa_itlnxb0VTPKS3
Sent from my HTC 10 using XDA-Developers mobile app

I went with this one 95mb read, 90mb writing 128gb http://www.amazon.com/Samsung-Micro...&redirect=true&ref_=oh_aui_detailpage_o01_s00

Fastest MicroSD :-
https://www.amazon.com/dp/B010NE3N3S/ref=psdc_3015433011_t2_B00NUB3530
Source:-
https://havecamerawilltravel.com/photographer/fastest-microsd-cards

I got this one https://www.amazon.com/gp/product/B01DYN4VPE/ref=oh_aui_detailpage_o00_s01?ie=UTF8&psc=1 which is $66 right now. I read that what is considered fastest is sustained fast write where if you are using the card as Adoptable Storage you may want fast 4Kb random writes which is not the same.
So, even where Extreme Pro exist I went for the Extreme in hopes the HTC 10 doesn't complain when adopting...and it didn't
Now I just have to keep searching for a plastic belt holster for a naked HTC 10..

4KB random reads are the most important for adoptable storage as you will be loading application data from the SD card.
4KB random write is also important but not as much as the read speed is.
To be fair though, random write speed is always much lower than random read speed, so focusing on as high random write speed as possible isn't a bad idea since if the random write speed is high, the random read speed will be high as well.
For reference the HTC 10 does about 10MB/s in both read and write for 4KB random.
As an example the 64GB size of Sandisk Extreme U3 has been benchmarked to be capable of 5.5MB/s and 0.5MB/s in 4KB random read and write respectively.
That card would be okay for adoptable storage, the read speed is halved compared to the internal storage but application writing data or updating them is excruciatingly slow.
Knowing the baseline 4KB random read/write speed of our internal storage and the usual SD cards, I would personally aim for at least 5MB/s read and 1.5MB/s read.
Higher end 32-64GB cards are usually capable of 7-10MB/s 4KB random read and 2-3MB/s 4KB random write. While Samsung's Pro+ 64GB card is crem de la crem at 10MB/s and 5MB/s respectively, about as good as it gets with current NAND technology.
Unfortunately SD card manufacturers don't advertise 4KB random speeds so we have to find the information ourselves and hope some kind soul has purchased the card we're looking at and benchmarked it with a decent card reader. Your best bet is to google the card make/model + crystaldiskmark or scour Amazon, Newegg and so on reviews for benchmark numbers..
If you find a review that states 4KB random speeds in IOPS (Input Output operations Per Second), the conversion to MBps = (IOPS * KB per IO) / 1024.
So if you have
4KB random read 1200IOPS = (1200*4)/1024 = 4.68MB/s
4KB random write 400 IOPS = (400*4)/1024 = 1.56MB/s
And the other way around IOPS = (MBps / KB per IO) * 1024