Develop Bugs

SD card speed - does this sound right?

A-Data 8gb Class 6 microSD, bought from meritline.com. I'm getting at most 5mb read, 7mb write but usually 5/5 or 5/3. I formatted it as Fat32 with 32k allocation unit on my PC then copied my old card to this one and inserted into phone.
Phone itself seems MAYBE a touch faster subjectively than the stock class 2. Quadrant score unchanged.
Maybe I was expecting too much?
Rom Fresh 3.5.0.1
Kernel Netarchy 4.1.9.1
No setcpu or other tweaking

class 6 means 6 m/b

So I bought a UHS-3 SD Card for my G3. Overkill?

Hi
I bought a SanDisk Extreme UHS-3 SD Card out of impulse today.
I'm unsure if the G3 has enough bandwidth to deal with it.
Has anyone bought a UHS-3 SD Card and is using on his G3?
Tapatalked thru my LG G3

Bump
Nobody tried? Couldn't find any info either
Tapatalked thru my LG G3

I am using a 64gb Sandisk extreme UHS-I U3 (UHS Level 3) card. Seems to work fine. I don't understand what issue you were logically expecting to experience.

gandalf_grey91 said:
I am using a 64gb Sandisk extreme UHS-I U3 (UHS Level 3) card. Seems to work fine. I don't understand what issue you were logically expecting to experience.
Click to expand...
Click to collapse
Improved speeds etc. I thought about using MultiROM on it.. Could you please run A1 SD bench and post the results?
I'm getting pretty much the same card as you

GTMoraes said:
Improved speeds etc. I thought about using MultiROM on it.. Could you please run A1 SD bench and post the results?
I'm getting pretty much the same card as you
Click to expand...
Click to collapse
Read 67.05MB/s Write 31.64MB/s

gandalf_grey91 said:
Read 67.05MB/s Write 31.64MB/s
Click to expand...
Click to collapse
Write speed looks very good, but read is disappointing...
thanks! But it seems that the G3 is limited to UHS-I =/

I am getting 38.44 and 20.03 only for samsung evo uhs 1 I guess your result is pretty good

Zenroid said:
I am getting 38.44 and 20.03 only for samsung evo uhs 1 I guess your result is pretty good
Click to expand...
Click to collapse
I'm using a Samsung Class 10 SD Card. Terrible 44.34MB/s read and 17.38MB/s write, default benchmark
Using the Precise Benchmark, I'm getting 59.7MB/s read and 19.22MB/s write. It's too bad.
In comparison, I'm getting 183.92MB/s read and 38.7MB/s write on the internal memory (precise benchmark, with reboot)
I expected somewhere near the internal memory read speeds with the Sandisk extreme, but at least there's the decent write speed.
I wanted to run some ROMs on the memory card, but with those read speeds, it doesn't seem feasible.
Or perhaps the G3 internal memory is just absurdly fast. I'll try with some other devices around my home
---
Funny. The Galaxy S4 Mini here has slower internal memory than my Class 10 SD Card. But still, if I install Android on my SD Card, it'll be as slow as taking 10~20 seconds to open a simple app.
I don't get it

gandalf_grey91 said:
Read 67.05MB/s Write 31.64MB/s
Click to expand...
Click to collapse
Just received my UHS-3 card.
Pretty disappointed by the read speeds.
I was getting ~65MB/s read and ~14MB/s write.
The SanDisk Extreme is giving me ~48MB/s read and ~30MB/s write.
Massive improvement in write, but messed up in read.... I don't know what's wrong

GTMoraes said:
Just received my UHS-3 card.
Pretty disappointed by the read speeds.
I was getting ~65MB/s read and ~14MB/s write.
The SanDisk Extreme is giving me ~48MB/s read and ~30MB/s write.
Massive improvement in write, but messed up in read.... I don't know what's wrong
Click to expand...
Click to collapse
Being the inventor of trans flash memory, Sandisk seems to feel the need to provide a distinct USP, over and above the competition, for it trans flash memory products. Unfortunately this usually means they are surfing very close to edge of their fabrication technology. I base this on my observation of the ever-changing product code attached to Sandisk 128GB micro sd cards, which has changed 3 times in the last 10-12 weeks.
Put simply, like CPUs, I believe Sandisk are speed testing and grading their trans flash products, the extreme range is exactly the same as the ultra range, only labeled and marketed differently. Because there is no distinct technological advantage, there is likely to be a more pronounced range in both read and write speeds. So, while a tested write speed of, for example, 30MB/s may mean an individual micro sd card can be labeled as "extreme" by Sandisk, doesn't mean its read speed will be consistent with every other micro sd card labeled as "extreme".
Oh, and remember, only 4KB random write speed is the true write speed test for memory cards. This is the specification that makes the real difference if you need to boot an OS from the card.

gandalf_grey91 said:
Being the inventor of trans flash memory, Sandisk seems to feel the need to provide a distinct USP, over and above the competition, for it trans flash memory products. Unfortunately this usually means they are surfing very close to edge of their fabrication technology. I base this on my observation of the ever-changing product code attached to Sandisk 128GB micro sd cards, which has changed 3 times in the last 10-12 weeks.
Put simply, like CPUs, I believe Sandisk are speed testing and grading their trans flash products, the extreme range is exactly the same as the ultra range, only labeled and marketed differently. Because there is no distinct technological advantage, there is likely to be a more pronounced range in both read and write speeds. So, while a tested write speed of, for example, 30MB/s may mean an individual micro sd card can be labeled as "extreme" by Sandisk, doesn't mean its read speed will be consistent with every other micro sd card labeled as "extreme".
Oh, and remember, only 4KB random write speed is the true write speed test for memory cards. This is the specification that makes the real difference if you need to boot an OS from the card.
Click to expand...
Click to collapse
That was very informative. Yes, it seems that Sandisk is pushing any 30MB/s write card as Extreme, and if it complies with a minimum read (very minimum it seems), it's off to go.
I'm unsure whether should I return this card (need to pay shipping costs) or keep it as it is
Many thanks for this answer! I'll check for random 4kb write to see which one fares better
Tapatalked thru my CM12 G3!

GTMoraes said:
I'm unsure whether should I return this card (need to pay shipping costs) or keep it as it is
Click to expand...
Click to collapse
Two quotes from the Sandisk legal statement about Extreme 64GB micro sd card:
2) Card only. Up to 80 MB/s read; up to 50 MB/s write. Based on internal testing; performance may be lower depending upon host device.
(4) UHS Speed Class 3 designates a performance option designed to support real time video recording in U3-enabled host devices.
---------- Post added at 11:41 PM ---------- Previous post was at 11:26 PM ----------
GTMoraes said:
I'm unsure whether should I return this card (need to pay shipping costs) or keep it as it is
Click to expand...
Click to collapse
Sorry, previous numbers were for 64GB Extreme Plus micro sd cards (Costs twice as much). For 64GB Extreme micro sd card it should have read:
(2) Up to 60 MB/s read speed; up to 40 MB/s write speed. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.
See what I said about grading the speed of the cards. Just so they can squeeze a little more money from their customers. BTW I see that Kingston and Lexar are doing 128GB micro sd cards now.

gandalf_grey91 said:
Two quotes from the Sandisk legal statement about Extreme 64GB micro sd card:
2) Card only. Up to 80 MB/s read; up to 50 MB/s write. Based on internal testing; performance may be lower depending upon host device.
(4) UHS Speed Class 3 designates a performance option designed to support real time video recording in U3-enabled host devices.
---------- Post added at 11:41 PM ---------- Previous post was at 11:26 PM ----------
Sorry, previous numbers were for 64GB Extreme Plus micro sd cards (Costs twice as much). For 64GB Extreme micro sd card it should have read:
(2) Up to 60 MB/s read speed; up to 40 MB/s write speed. Based on internal testing; performance may be lower depending on host device, interface, usage conditions and other factors.
See what I said about grading the speed of the cards. Just so they can squeeze a little more money from their customers. BTW I see that Kingston and Lexar are doing 128GB micro sd cards now.
Click to expand...
Click to collapse
I emailed my seller and he posted pretty much the same thing, and said my card was well within the normal operating speeds, and a replacement wouldn't make it any better.
I'm getting 51MB/s read and 33MB/s write nowadays. Guess something was running on the background back then.
Guess I'll have to live with it. It ain't too bad, and random 4k is better than the Samsung one
Tapatalked thru my CM12 G3!

The Extreme cards will get 40-50 but the Extreme Plus get around 80. The newer Pro gets 95. Its obvious Sandisk is inching forward trying to create a new product with a +$100 price point. I got lucky during the holidays and scored my 64gb Extreme Plus during the holidays for $30

xlxcrossing said:
The Extreme cards will get 40-50 but the Extreme Plus get around 80. The newer Pro gets 95. Its obvious Sandisk is inching forward trying to create a new product with a +$100 price point. I got lucky during the holidays and scored my 64gb Extreme Plus during the holidays for $30
Click to expand...
Click to collapse
Now that was a deal. I got my Extreme 64GB for what would be 90 US Dollars. That's the price around here unfortunately.
I've contacted again my seller and he seems to be okay with swapping my card. I ran the SD test three times for each of my 64GB cards to see how they would fare.
As expected, the Samsung has a higher read speed, but minimum write (Class 10, Minimum 10MB/s write speed, as I've read).
The SanDisk Extreme has a slightly lower write speed than what I thought would be 30MB/s, but nothing too bad. But read speeds are not that good, compared to a lower-end rival card.
http://imgur.com/a/KNGpT

Micro SD Card compatability?

I know, this is probably a silly question, but am I the only one that notices how devices only tend to label compatibility with Micro SD cards based on size, and not speed or class? For instance, my Galaxy Tab S2, it simply says it can take up to a 128gb SD card, but it does not say what speed it will work with.
The reason I ask, is that I am now in the market for a 128gb card, and yet I don't want to buy an expensive fast one, if my tablet will not be able to take advantage of the premium speed. Anyone have any thoughts?

I don't know about the speed but I have a SanDisk 200 GB that runs fine.
I think that any phone or tablet that will read 128 GB will also work with 200 GB.
Shofar

Don't worry
Any MicroSD card will work in your Galaxy Tab S2. But then, you might have to format it. When you buy the card, keep an eye out on the speed class- higher speeds are much better!
You are looking for a 128GB card, and I use one in my tablet so don't worry. It will work! But I seriously recommend a higher performance card because it can get very slow with cheaper cards.
Hope this helps!

I just tested a regular class 10 card and a UHS-1 card. Both tested at 9mb write and 40mb read. The same UHS-1 card tested over 40mb write using an Odroid C1 board.

lewmur said:
I just tested a regular class 10 card and a UHS-1 card. Both tested at 9mb write and 40mb read. The same UHS-1 card tested over 40mb write using an Odroid C1 board.
Click to expand...
Click to collapse
I suppose that means that using anything above class 10 is irrelevant?

wirelesskebab said:
I suppose that means that using anything above class 10 is irrelevant?
Click to expand...
Click to collapse
No, that means that "class" classification is outdated. Fast cards (read and write) bear the UHS-I "U3" classification, "U1" is slower.
In future, only buy U3 cards, like the SanDisk Extreme family.

saintsimon said:
No, that means that "class" classification is outdated. Fast cards (read and write) bear the UHS-I "U3" classification, "U1" is slower.
In future, only buy U3 cards, like the SanDisk Extreme family.
Click to expand...
Click to collapse
I guess you missed the part where I stated that the UHS card had a write speed of 40mb using the Odroid C1 board. Obviously, when it only writes 9mb in the S2, then the S2 itself doesn't support the higher speeds. So, no matter ability the card has, if the device's bus doesn't support the higher speed, then the card's ability is meaningless. Any card you use is going to be limited by the bus speed of the device.
Paying extra for a better card is pointless if the device doesn't support the higher speed.

lewmur said:
I guess you missed the part where I stated that the UHS card had a write speed of 40mb using the Odroid C1 board. Obviously, when it only writes 9mb in the S2, then the S2 itself doesn't support the higher speeds. So, no matter ability the card has, if the device's bus doesn't support the higher speed, then the card's ability is meaningless. Any card you use is going to be limited by the bus speed of the device.
Paying extra for a better card is pointless if the device doesn't support the higher speed.
Click to expand...
Click to collapse
This was what I meant, I'll make sure to buy a decent one but not the "best". Quick question, how are the internal memory write speeds? Actually, what card should I get then? How fast is the internal memory write speeds? Thanks!

Just tested the 32 GB SanDisk Extreme (U3 but not an Extreme Plus or Pro) in my T815 with the "A1 SD Bench" app:
read 59,70 MB/s or 61,04 MB/s, write 22,75 MB/s or 24,70 MB/s. The second numbers are the result of using the "accurate mode" of the test app.

saintsimon said:
Just tested the 32 GB SanDisk Extreme (U3 but not an Extreme Plus or Pro) in my T815 with the "A1 SD Bench" app:
read 59,70 MB/s or 61,04 MB/s, write 22,75 MB/s or 24,70 MB/s. The second numbers are the result of using the "accurate mode" of the test app.
Click to expand...
Click to collapse
Wat?! Is it possible that the LTE version (T815) vs T810 has a different card reader? If not happy days!

wirelesskebab said:
This was what I meant, I'll make sure to buy a decent one but not the "best". Quick question, how are the internal memory write speeds? Actually, what card should I get then? How fast is the internal memory write speeds? Thanks!
Click to expand...
Click to collapse
Why don't you install the A1 SD Benchmark from the Play Store and test your own cards? My internal storage rates 50mb write and 160 read.

Hi,
I'm considering this microSD for my new tablet s2, do you think is good quality?
http://www.amazon.it/Memoria-SanDisk-Android-MicroSDXC-Adattatore/dp/B010Q57S62/

nephtys59 said:
Hi,
I'm considering this microSD for my new tablet s2, do you think is good quality?
http://www.amazon.it/Memoria-SanDisk-Android-MicroSDXC-Adattatore/dp/B010Q57S62/
Click to expand...
Click to collapse
I am using this SanDisk 128 GB Micro SDXC UHS-1 / Class 10 card and it works fine! The price/performance is good.
In germany (Amazon.de) you can get the card for 33 € (+shipping costs).

nephtys59 said:
Hi,
I'm considering this microSD for my new tablet s2, do you think is good quality?
http://www.amazon.it/Memoria-SanDisk-Android-MicroSDXC-Adattatore/dp/B010Q57S62/
Click to expand...
Click to collapse
For our fast S2, this one is too slow in writing. Class 10 means only fast reading.
You better choose a Samsung or SanDisk with the "U3" designation, which means fast writing, like this:
http://www.amazon.it/Scheda-Memoria...sr=1-5&keywords=sandisk+extreme+pro+microsdxc

FOR EVERYBODY :
I have bought a LEXAR 633x 200GB !!!
And it works !
Speed : read 95Mo/s write : 40Mo/s
For 90$, it do the job very well !
The only better sdcard is the 256GB SAMSUNG but it's out of price !
​

So a higher performance card or 200GB eill make the tab s2 go faster then? What amount of storage and sd card do you recommend?

It won't make the tab S2 go faster. But it will allow faster read/writing to higher performance sd card compared to a regular one. The S2 can only go as fast as it's hardware can, with or without a microsd card.

Figured I'd share my results with my 2015 S2 8.0 (SM-T710). Right now I have a Samsung EVO Pro (U1) 64GB in my tablet and it does ok, but I'm just about to upgrade it to a new 128GB EVO PLUS (U3) card so got some results below. Note the previous 32GB card I had was waay worse, much older and only did 4MB/sec on writes (forgot the brand) but things have at least come a long way in the years since.
Results as follows...
Samsung EVO Pro 64GB (U1) - 70.53MB/sec Read - 72.86MB/sec Write (Fresh Format)
Samsung EVO Plus 128GB (U3) - 69.91MB/sec Read - 43.40MB/sec Write (Fresh Format)
Samsung EVO Pro 64GB (U1) - 70.07MB/sec Read - 17.81MB/sec Write (Only 4.9GB Free)
Samsung EVO Plus 128GB (U3) - 63.08MB/sec Read - 27.12MB/sec Write (Only 65.9GB Free)
For the heck of it tried the transfer rates on the PC for the 2 cards as well.
Samsung EVO Pro 64GB (U1) - 86.85MB/sec Read - 80.77MB/sec Write (Fresh Format)
Samsung EVO Plus 128GB (U3) - 87.04MB/sec Read - 82.27MB/sec Write (Fresh Format)
Though got to say while cards neck and neck, small file writes where 5x greater on the new U3 card (.5MB/sec vs 2.5MB/sec) on 4k writes.

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

horrible microSD card speed

Hey everybody,
did somebody else notice that the microSD chipset/bus on this device is absolutely horrible?
I bought a SanDisk extreme plus 64 GB card rated for UHS-I U3 V30 A1 class with up to 100 Mb/s sequential read and up to 90 Mb/s sequential write. According to several websites that card actually gives that performance almost entirely.
I bought that card for my Nintendo switch but tested it on my Moto Z2 force. Shockingly the card doesn't even reach 40 Mb/s on either seq read nor write.
Putting that same card in my old Motorola Z it yields 86 Mb/s read and 68 Mb/s write speed. The IOPS are also massively higher on the older phone.
I tried different schedulers, different read ahead values aswell and cfq offered the best performance.
Using the same settings on my Z2 force makes no difference, still abysmal performance.
Can someone confirm that this isn't specific to my phone alone?
Kind regards

regenwurm16 said:
Hey everybody,
did somebody else notice that the microSD chipset/bus on this device is absolutely horrible?
I bought a SanDisk extreme plus 64 GB card rated for UHS-I U3 V30 A1 class with up to 100 Mb/s sequential read and up to 90 Mb/s sequential write. According to several websites that card actually gives that performance almost entirely.
I bought that card for my Nintendo switch but tested it on my Moto Z2 force. Shockingly the card doesn't even reach 40 Mb/s on either seq read nor write.
Putting that same card in my old Motorola Z it yields 86 Mb/s read and 68 Mb/s write speed. The IOPS are also massively higher on the older phone.
I tried different schedulers, different read ahead values aswell and cfq offered the best performance.
Using the same settings on my Z2 force makes no difference, still abysmal performance.
Can someone confirm that this isn't specific to my phone alone?
Kind regards
Click to expand...
Click to collapse
It's not your phone. Mine is slow reading my 400gb SanDisk. My v30+ is slow in this too.

There was some testing done on notebookcheck.net on both of those models and the SD card behavior wasn't nearly as pronounced but they used a different reference card. I don't think it's horrible but I don't expect to get anything near the max values in real life situations

For both models I asked Motorola support about the specific classification of the SD card bus but they never could get anymore specific than UHS-I. Questioned if only UHS-I U1 or U3 or possible max speeds could not be answered for both phones.
I think it's pathetic for a 800€ phone to be outdone immensely by its 650€ predecessor in that regard.
The Z2 force itself is in anyway better than the Moto Z but it's still annoying that they downgraded the SD card reader so heavily.