Develop Bugs

Memory card class

I'll go tomorrow to buy a HTC HD2. But it comes with a 2Gb microSD card that is too small for me.
I would like to buy a 8 GB or 16 GB memory card, only for the phone. Does the class really matters? I've searched and searched again, but I didn't find a good answer. It is a class 2 enough or i should go for a class 4 or class 6?
Price is also important.

What's that phrase people are always spouting off? Get the biggest/fastest that you can afford? The higher the class the faster (theoretically) the data transfer. If you look around you can get an 8GB Class 6 for about $23.

Is not so simple. A 6 class 8GB card or a class 2 16 GB card(same price)? And Ive read that it dose not matters so much the class, but i asked here for a confirmation.

I just read an article about that
It seems that the class you are talking about only applies to the writing speed it doesn't say anything about read speeds.
and since writing speed isn't that important for a smartphone you can get a class 2 because writing speeds are similar most of the time.
I got the following numbers of a dutch website tweakers.net:
here are some numbers:
The Nokia 16GB microSDHC
Class 2x
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Transcent 16GB MicroSDHC
class 6x:
Sequential Read : 14.758 MB/s
Sequential Write : 7.860 MB/s
Random Read 512KB : 14.741 MB/s
Random Write 512KB : 2.026 MB/s
Random Read 4KB : 4.506 MB/s
Random Write 4KB : 0.023 MB/s
Here is a comparison of the Nokia against the Transcent micro sdhc so you see that the nokia is:
Sequential Read : 36,11% faster
Sequential Write : 16,46% slower
Random Read 512KB : 35,20% faster
Random Write 512KB : 96,89% slower
Random Read 4KB : 18,83% slower
Random Write 4KB : 21,05% slower
So out of these benchmarks you can conclude that the higher class cards only give you better writing speeds. And the important speeds are the reading speeds on a smartphone.
I hope this helps you a bit

hy, in my knowledge HC classes are invented for DSLR cameras, because they need to be able to take 4,6 10 pics /sec, (technically write on the card big amount of data (2-3Mb even more in RAW) in seconds, for smartphones it's ok a HC 2
by the way I have a 4GB SDHC2 and it's set to recognize as a HC1 (do no why but it's faster)
hope it helped

[Q] Class 10 microSDHC with same write performance stats as a class 4 card?

I recently bought a genuine class 10 Kingston 16GB microSDHC card to replace my class 4 Kingston 16GB microSDHC for my HTC Desire GSM. I have a freshly installed LeeDroid v2.4.1 ROM with S-Off. I did a full wipe/factory reset/format before installing LeeDroid. I created a 15GB FAT32 partition and a 1GB EXT3 partition on both cards for using A2SD+. After comparing both cards (while in my HTC Desire) with 2 benchmark apps from the Market, AnTutu System Benchmark and SD Tools, I'm having some problems.
The problem is that the write performance is almost the same on both the microSDHC cards, around +/- 5 MB/sec. Installing the SD Speed Boost app didn't help in improving the write performance. According to the microSDHC specification I should have at least around +/- 10MB/sec write performance with a class 10 microSDHC card.
I searched a bit here on XDA, and I'm reading some conflicting things. Some say that the HTC Desire supports only up to class 6 microSDHC cards, while others say that the brand new class 10 card they bought on eBay gave them a massive performance boost with max write performance. Also I'm reading that having multiple partitions on a microSDHC card has a negative impact on write performance. Is this true?
Anybody have any suggestions or ideas?

Hello
I have no idea and no suggestions sorry , and I agree with you, everything is strange with writing speed. I think that the "class" is bull**** from my point of view.
Just see my "class 4" card tested with SD tools:
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I have a S-ON Desire with Oxygen 2.0.3, and "class 4" 8Go card with a first Fat32 partition (=6.5GGo) and a second partition Ext4 (1Go) ...

I have a class 10 too... but I think Desire's SD handler is the real bottleneck. Did you try and test your SDs on a USB2.0 card reader attached to your computer? You should see the difference among the two.

I just testes my SD performance with SD Tools and I got 8MBs write and 23.5MBs read with a class 2 card. People tend to say that class 6 is better than class 10, in most cases anyway.
Sent from CM7

wierd isnt it?
16mb writing speed and 8mb reading speed ... thats class 4 kingston card.
not rooted,

Writing speed > reading speed ????

Kingston 4gb class 4 gives me over 8mbps write. ;-) better than Samsung plus class 6.
Also, after some testing I came to conclusion that smaller the size, the faster it is.
Sent from my HTC Desire using XDA App

probably, my card is 4gb btw if you were wondering why i had such high writing and reading speed

I recently bought an USB 2.0 card reader from Sitecom, but that one broke down on me before I could test the microSDHC cards. The first few days it worked fine, but now it won't recognize any cards anymore...
The results you guys posted really surprised me, such wide variation in performance. Yesterday I called HTC Netherlands and asked them if there are any limitations or restrictions on the HTC Desire regarding the max supported class cards. They couldn't give me an answer straight away (they said I was the first person to ask this question... ), but they are going to do some research regarding this and report back to me. As soon as I get an answer I will post it here.
For now I'm at a loss. The smaller the card the faster it's speed under the same class sounds logical. Also I'm thinking that certain brands might be more compatible or incompatible with the HTC Desire. After researching it some more, I came across some information about people saying that Kingston isn't the best brand to choose for the HTC Desire.

For those who are curious..... HTC Netherlands called me back, after some research at there end they could tell me that the HTC Desire supports up to class 6 microSDHC cards. They also mentioned that some brands are better then other brands when used in there smartphones, although they didn't provide any specific brands.

Memory card Benchmarks

I'm wanting to get a new memory card, preferably 32gb but I'm unsure which company to go for.
So it'll be helpful if you could benchmark your own memory cards with SDTools and also include class and manufacturer ( I find that different benchmark apps produce different results)
Without SD-Booster (Which btw is very effective)
Currently mine is a Samsung 16GB Micro SDHC Card - Class 10
Write : 12.3MB/s
Read : 21.5MB/s
Was messing around with the SD-Booster, and my read speed now is 28.5MB/s at 4096kb cache
SevenD2 said:
Even though in the OP I state don't use SD-Booster I've found out that different ROMS use different default Caches
Click to expand...
Click to collapse
Use Cache 1024mb for fair testing

SevenD2 said:
I'm wanting to get a new memory card, preferably 32gb but I'm unsure which company to go for.
So it'll be helpful if you could benchmark your own memory cards with SDTools and also include class and manufacturer ( I find that different benchmark apps produce different results)
Without SD-Booster (Which btw is very effective)
Currently mine is a Samsung 16GB Micro SDHC Card - Class 10
Write : 12.3MB/s
Read : 21.5MB/s
Click to expand...
Click to collapse
I am running with a Samsung 32GB Micro SCHC Card - Class 10
the benchmark would be like the 16GB you have. with SD-Speed Increase it is even a little better (I think, haven't tested it). I can recommend the 32GB Class 10, so far great speed and no complaints =)

Patriot 32GB Class 10:
Write: 8-10MB/s according to the app, when I copy stuff from my pc to the phone it goes to 13.7MB/s or even more with big files
Read: 16-28MB/s according to thr app
But there are ~27.5GB data on it which might slow things down a bit
Sent from my iPad 2 using Tapatalk

Here are the results of my 2-year-old SD Card, a Transcend 8GB Class 6:
Write: 8.2 MB/s
Read: 17 MB/s
I am very pleased with it. My next one though will be this one, the 32GB one:
http://www.sandisk.com/products/mob...crosdhc-and-microsdxc-uhs-i-cards-for-android

Transcend 16GB class 4 (2011)
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mustang 32 gb clas 10
write: 13MB/S
read:17.4 MB/S

Kingston 16gb class 10
7,8mb/s write
21,9mb/s read
Enviado desde mi LT18i usando Tapatalk 2

Trandscend 32GB class 10
W = around 10, sometimes 9, sometimes 11
R = minimal 20, sometimes can 28

Samsung Plus Extreme 8GB Class 10
Write 11.2MB/s
Read 18.8MB/s

Samsung Mobile Ultra 16GB
Write: 13.7
Read: 27.5
3072 cache size

Verbatim 16GB Class10. SD-Booster cache set to 8192

Samsung 32 GB Class 10
Write 9,2MB/s
Read 27,5 MB/s
SD-Booster at 2048

Samsung class 2 16GB
Read: 8 MB/s
Write: 20 MB/s
PS: Without SD Booster

Sandisk Ultra Mobile class 10 32gb
SD-Booster at 4096

Even though in the OP I state don't use SD-Booster I've found out that different ROMS use different default Caches

Se arc s stock 4.0.4
Transcend Class 4 32GB

Arc with stock sd card 8 GB class 4
writing
8.6 MB/s
Reading
13.7 MB/s
on cache of 256 kb ..

any body help me where to buy class 10 sd card in india?

SanDisk Ultra microSDHC/microSDXC UHS-I Class 10
Write = 14,3 Mb/s
Read = 21,1 Mb/s
Hmm Quite Good

Strontium 16GB Class 10

3 class 10 sdhc cards only one is really lol

I have there class 10 32 GB SDHC cards - one from my old t-bolt the one in my gfs SG II and the one in my note.
I ran a bench on my PNY and sure enough it did not come near class 10.
So I got all three togehter - backed them up - did a full fat 32 format (not quick) on win 7 and tested all three. On the pc and in the note -
PC Via ATTO
Note via antutu
Of the three brands I had Lexar, PNY and Sandisk - all three supposed to be class 10.
Only the lexar - which was sitting in my unused t-bolt - actually ran class 10 posting 13.6 MB/s writes and 22 MB/s reads..
The others not so much - both the Sandisk and PNY barely managed class 6 writes....

makes me happy for having a 32gb lexar class 10 card then

Just got a sandisk uhs-1 32GB not any faster than my class 10. dissapointed again.

glenroebuck said:
Just got a sandisk uhs-1 32GB not any faster than my class 10. dissapointed again.
Click to expand...
Click to collapse
UHS-1 = Class 10
Sent from my GT-N7000 using Tapatalk 2

lagittaja said:
UHS-1 = Class 10
Sent from my GT-N7000 using Tapatalk 2
Click to expand...
Click to collapse
that is not true at all - uhs-1 is 50-70 mb/s in uhs-1 supported devices which Samsung has said the note does support.

testing some more - added in samsung class 6 16 gb I got cheap at microcenter on sale.
Ummm. wow. The class 6 samsung runs as fast as any class 10 or uhs-1 I have tested. Faster in fact than everything but the lexar. Just shy of 11 mb/sec writes in my note and 27.1 mb reads - fast enough for hd video recording. I may order a class 10 sammy to see what it can do!

just ran it through Crystal Disk Mark - here is the results - again this is a cheaper class 6 card
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in comparison 32gb UHS-1

Can anyone recommend a similar program for Linux, or even an Android app?
I've tried using dd, with various sync options, but get inconsistent results.
thanks much indeed...

cdmackay said:
Can anyone recommend a similar program for Linux, or even an Android app?
I've tried using dd, with various sync options, but get inconsistent results.
thanks much indeed...
Click to expand...
Click to collapse
Antutu benchmark has a built in file read/write test.
On antutu my n7000 gets I think 10Mb/sec write and 22MB/sec reads
My 2.5 year old class 6 16GB uSD card gets 4.5MB writes and 14MB reads in the note.

sd tools from the market as well will test your sd card. I do a full format before I test though. Framentation and data can affect your results.

lagittaja said:
UHS-1 = Class 10
Sent from my GT-N7000 using Tapatalk 2
Click to expand...
Click to collapse
Why make it so confusing
why not just write class 10 on card ???

ilordvader said:
Why make it so confusing
why not just write class 10 on card ???
Click to expand...
Click to collapse
Because it's not true: UHS-1 does not equate to Class 10.
On a device that supports UHS-1, it will be very much faster than Class 10.
On a device that does not support UHS, it won't.

Kingston 128GB Class 10 SD Card review

Kingston introduced its 128GB Class 10 UHS-I Speed Class 1 (U1) microSD for smartphones and
tablets last year. Since this is a class 10 Card, it promises a minimum data transfer rate of 10MB/s.
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The company doesn’t reveal maximum read and write speed, but we will test out both the read
and write speed of the card. How good is the card? Let us find out in the complete review.
Several top-end and mid-range smartphones now support 128GB microSD cards. Even low-end
Lumia devices support 128GB cards, according to Microsoft. We tested this card from the top-end
Galaxy Note 4, Note Edge, HTC One M8 to mid-range Samsung Galaxy A5, Galaxy A3 and several
other smartphones, which worked fine without any issues. We also tried it on the Moto G (2nd
Gen), but it did not work since it supports microSD card only up to 32GB.
Here are some benchmarks to show how this card performs.
Read/Write speed test using.
CrystalDiskMark x64 – USB 3.0
Read/Write speed test using CrystalDiskMark x64 – USB 2.0
Sequential read speed was around 87 MB/s and write speed was around 30 MB/s in the
CrystalDiskMark benchmark using USB 3.0. Using 2.0 you get sequential read speed of 35 MB/s
and write speed of about 23 MB/s. As you can see, you get 118GB of usable space in the 128GB
card.
Read Speed measured using HD Tach – USB 3.0
Read Speed measured using HD Tach – USB 2.0
Read speed was steady at 80 MB/s using USB 3.0 in HD Tach. Using USB 2.0 connection, it was
steady at 35 MB/s. Both these tests make it clear that using a card reader with USB 3.0 support
lets you transfer data faster between your PC and the card. Data transfer speed will be different
when you are using it in a smartphone. Let us check the transfer speed of the card in a phone.
Read and Write speed using A1 SD Bench for Android
The read speed was around 53.9 MB/s and the write speed was around 10 MB/s with the A1 SD
Bench app for Android. Some testing apps like SD tools and SD Card Tester did not work and
showed errors, hence we could not test the speed using those apps.
Conclusion
The Kingston 128GB Class 10 microSD XC card offered impressive and steady write speed and
read speed for a UHS-I U1. We have come a long way in expansion memory. Few years back
512MB and 1GB cards were the top-en, now we have 128GB cards. Since we now have
smartphones that is capable of recording 4K videos, which takes of several GBs of space for a
few minute video, having a 128GB card handy lets you store several hours of 4K videos. Having a
memory card slot in your smartphone is always useful if you play more games in your smartphone
or store a lot of media content, and if it supports 128GB microSD cards, it would be even better.
Main thing you should notice about the 128GB cards is the compatibility. Check the official
smartphone or tablet maker’s website to find out if your device supports 128GB cards. Even
though most latest mid to high-end devices do, some smartphones only supports maximum 32GB
or 64GB cards. The Kingston 128GB SD card is available for $99.99 in the U.S. Kingston also introduced high capacity UHS-I
U3 microSDXC cards few months back. We will be reviewing the Kingston 64GB UHS-I U3
microSDXC card soon, which offers 90MB/s read and 80MB/s write speed.

Wow. So fast. My 32gb EVO Samsung microsd is already OLD
Nice

Hahah
Sent from my XT1022 using XDA Free mobile app

Nice review ! ??

Thank you for reading!