[Q] New format for SD cards larger than 32GB, is compatibility possible? - HTC Sensation

Hi all, I heard that SanDisk has just announced their first SDXC card ever, a 64GB Class 6 microSD card that is designed for smartphones and tablets. While I don't predict that anyone would own one in the near future, I also predict that when people do get their hands on them, HTC probably won't have updated their handsets to allow compatibility with them.
I'm guessing a lot of people already know this, but I'm sure that quite a few of the people here don't quite understand why SDXC cards aren't currently compatible with our phones, like SDHC or regular SD cards are.
It's because once a source of flash memory, such as a SD card, surpasses 32GB capacity, it is no longer efficient to use the current standard FAT32 file system on them. Instead, they must use exFAT, which supports MUCH higher transfer rates and capacities.
Good news: the hardware used to read SD/miniSD/microSD cards with a FAT32 format is perfectly compatible with cards of the exFAT format.
Bad news: the software on the device that serves as the card's host probably won't be compatible with the exFAT format at this time.
Fortunately, from what I understand, this can be solved with a simple software update that shouldn't involve whole changes to Android. In fact, the ability to read and write in the exFAT format was released as an optional update a couple months back for Windows PCs.
What I'm asking is, for all devs out there, how difficult (and/or practical) would it be to implement the ability to read/write in the exFAT format in your ROMs? Or at least, could a mod be made that allows exFAT compatibility?

Related

[Q] 32GB exernal slot on new phone?

Most new phones seem to lack external microSD card slots. I would like to get pointers to current or future phones that support external 32GB microSD cards (or higher).
I currently own an ancient Touch Pro 2, but won't bother upgrading until I can use my 32GB microSD card with a new phone.
Do any of you have any nice suggestions to current or future phones that support external microSD cards?
Bump!
I would really appreciate tips on models, (android, and windows 7) current or upcoming, that supports external 32GB microSD cards?
Surely some informed genius must know this

Samsung Galaxy SIII 128GB micro SD supported?

Hey just got my SIII and was wondering if it supports a 128GB micro sd card? I couldn't find any info on it so thought i would just ask here.
thanks for any info
i think the data-sheet over at samsung.com states, that micro-SD's up to 64 GB are supported.
i guess that some 128GB cards might work, but aren't officially supported.
Wow its great........
Sent from my GT-S6102 using xda premium
Broken303 said:
i think the data-sheet over at samsung.com states, that micro-SD's up to 64 GB are supported.
i guess that some 128GB cards might work, but aren't officially supported.
Click to expand...
Click to collapse
Ile get a 64GB sd card instead. Just to be on the safe side
Broken303 said:
i think the data-sheet over at samsung.com states, that micro-SD's up to 64 GB are supported.
i guess that some 128GB cards might work, but aren't officially supported.
Click to expand...
Click to collapse
I think all the devices that Samsung has produced all stated 32GB was max, but it turned out 64GB worked too. Let's hope that logic still holds when the 128GB is released!
Does anyone know when we will see 128GB microSD cards in the market?
Or perhaps there is a way to fit a full SDXC card into a microSD slot using an adapter and hiding it underneath the battery cover or connecting it using a thin laminate conductor that could be wedged through one end of the battery cover...
I'm not sure about any FAT32 limitations other than 4GB file size limit, but as long as the S3 supports microsdxc (which it does since it supports 64gb cards), it should be able to support any sdcard size.
I myself have a 64gb microsdxc card and have done a lot of research.
TL;DR: Galaxy S3 supports any size microsdxc card.
---------- Post added at 01:42 PM ---------- Previous post was at 01:38 PM ----------
g00ey said:
Does anyone know when we will see 128GB microSD cards in the market?
Or perhaps there is a way to fit a full SDXC card into a microSD slot using an adapter and hiding it underneath the battery cover or connecting it using a thin laminate conductor that could be wedged through one end of the battery cover...
Click to expand...
Click to collapse
I'm not sure when we'll see 128gb microsd cards but I heard that sandisk developed the NAND. Hopefully Android 4.1 supports exFat (or does it already?) so we can actually utilize cards that big. The main reason to use a card that big would be for storing movies and TV shows, but any files over 4gb would have to be broken up first which is a PITA to do.
maybe in the future
Matt190191 said:
Hey just got my SIII and was wondering if it supports a 128GB micro sd card? I couldn't find any info on it so thought i would just ask here.
thanks for any info
Click to expand...
Click to collapse
Not yet!
This may seem like a random question, but why are 64Gb Micro SD cards cheaper than 64Gb SSD's. Are they not both flash? Does it have do do with the read/write speeds?
i wish
08cherd4 said:
This may seem like a random question, but why are 64Gb Micro SD cards cheaper than 64Gb SSD's. Are they not both flash? Does it have do do with the read/write speeds?
Click to expand...
Click to collapse
I wish 64GB micro SD cards were cheaper than 64 GB SDDs
on amazon 64GB SSD start from $60, 64GB micro SD cards start at $70
galaxy s3 on 128 gb
it is possible in galaxy s3.. with 64gb internal memory and support of 64gb on external memory.. but i dont know how much it will slow down the phone..
would recommend to use class 4,6 or even higher ones of mini sd card available for better results
Those aren't out yet......
Hey there,
The 128GB MicroSDXC cards have not come out yet so there's no point speculating early.
The Galaxy S III is stated to support up to 64GB currently, as that is the largest sized card out so far under the MicroSDXC banner. Once the 128GB cards are released, it SHOULD support those unless for some reason it has an artificial restriction imposed on it.
The other thing is, once the cards DO come out, people like NZTechfreak will check it out for us anyway. The cards should hopefully start to be released in a few more months. Definately agree on the speed class advice, go with a minimum of class 6 or 8, anything slower will be painful for sizes above 32GB.
And the Galaxy S 3 does support ExFAT by the way. I've currently got a 32GB card in mine formatted as ExFAT with about 4 mkv files that are between 4.5-7GB each.
DicksonNZ said:
Hey there,
The 128GB MicroSDXC cards have not come out yet so there's no point speculating early.
The Galaxy S III is stated to support up to 64GB currently, as that is the largest sized card out so far under the MicroSDXC banner. Once the 128GB cards are released, it SHOULD support those unless for some reason it has an artificial restriction imposed on it.
The other thing is, once the cards DO come out, people like NZTechfreak will check it out for us anyway. The cards should hopefully start to be released in a few more months. Definately agree on the speed class advice, go with a minimum of class 6 or 8, anything slower will be painful for sizes above 32GB.
And the Galaxy S 3 does support ExFAT by the way. I've currently got a 32GB card in mine formatted as ExFAT with about 4 mkv files that are between 4.5-7GB each.
Click to expand...
Click to collapse
PLEASE NOTE TEXT BELOW IS A COPY FROM WIKIPEDIA
"Compatibility with SDHC
SDXC host devices accept all previous families of SD memory cards.[26] Conversely, SDHC host devices will accept SDXC cards that follow Version 3.0, since the interface is identical,[3] but the following issues may affect usability:
SDXC cards are pre-formatted with Microsoft's proprietary and patented exFAT file system, which the host device might not support. Since Microsoft does not publish the specifications of exFAT and its use requires a non-free license, many alternative or older operating systems do not support exFAT for technical or legal reasons. The use of exFAT on some SDXC cards may render SDXC unsuitable as a universal exchange medium, as an SDXC card that uses exFAT would not be usable in all host devices. Since the FAT32 file system supports volumes up to the SDXC's maximum theoretical capacity of 2 TB as well, a user could reformat an SDXC card to use FAT32 for greater portability between computers (see below). FAT32-formatted SDXC cards can be used in a host device built for SDHC if the host device can handle 64GB and larger volumes.
SDHC host devices will not test the new capability bits defined for SDXC 4.0 cards. It will therefore not be able to use the new features of SDXC, such as transfer speeds above UHS104 (104MB/s)."
So reading that I would infer yes the 64GB or some of them could work in the G3 but may not work above that without formatting to fat 32, if I read it right that is
yousefak said:
I'm not sure about any FAT32 limitations other than 4GB file size limit, but as long as the S3 supports microsdxc (which it does since it supports 64gb cards), it should be able to support any sdcard size.
I myself have a 64gb microsdxc card and have done a lot of research.
TL;DR: Galaxy S3 supports any size microsdxc card.
---------- Post added at 01:42 PM ---------- Previous post was at 01:38 PM ----------
I'm not sure when we'll see 128gb microsd cards but I heard that sandisk developed the NAND. Hopefully Android 4.1 supports exFat (or does it already?) so we can actually utilize cards that big. The main reason to use a card that big would be for storing movies and TV shows, but any files over 4gb would have to be broken up first which is a PITA to do.
Click to expand...
Click to collapse
FAT32 supports 2TB volume size w/ 4GB-1B file size constraints.
exFAT supports 64ZiB volume size w/ 16EiB file size constraints.
I use exFAT, which the S3 supports, owing to my 1080p MP4s taking in excess of 5GB.
Since the S3 can use exFAT, we are well future-proofed to the extent of the microsdxc format I imagine.
DicksonNZ said:
Hey there,
The 128GB MicroSDXC cards have not come out yet so there's no point speculating early.
The Galaxy S III is stated to support up to 64GB currently, as that is the largest sized card out so far under the MicroSDXC banner. Once the 128GB cards are released, it SHOULD support those unless for some reason it has an artificial restriction imposed on it.
The other thing is, once the cards DO come out, people like NZTechfreak will check it out for us anyway. The cards should hopefully start to be released in a few more months. Definately agree on the speed class advice, go with a minimum of class 6 or 8, anything slower will be painful for sizes above 32GB.
And the Galaxy S 3 does support ExFAT by the way. I've currently got a 32GB card in mine formatted as ExFAT with about 4 mkv files that are between 4.5-7GB each.
Click to expand...
Click to collapse
Actually they state 64GB SDHC not SDXC. An many are now finding out they are missing files (songs) when they leave it ExFat. So chances are it may not support larger than 64GB cards. I to have a 64GB SDXC card that I have formatted with my computer to Fat32.
This is according to my manual (Canadian/American version). The European may be different.
By the time 128GB cards are released and actually at a mass production price, people will be talking Galaxy S4.
Hmm 128gb sd card seems like ALOT. I have a 32gb with my GS3, so 48gb in total. I have alot of movies,videos,pictures,etc. and I still have about 12gb left.
08cherd4 said:
This may seem like a random question, but why are 64Gb Micro SD cards cheaper than 64Gb SSD's. Are they not both flash? Does it have do do with the read/write speeds?
Click to expand...
Click to collapse
I'm pretty sure SSDs have more sophisticated controllers and such. Though according to Google, SanDisk's 64GB MicroSDXC card is on average almost the same price as the 64GB SSDs here in the UK (£40-50). Also, even the fastest MicroSDs can only support about tenth of the transfer rate of an SSD (although they are still pretty fast... the 64GB card is supposedly capable of up to 30MB/s, which is impressive).
rushless said:
By the time 128GB cards are released and actually at a mass production price, people will be talking Galaxy S4.
Click to expand...
Click to collapse
You might not be too far off actually. I mean, folks getting excited about the new 5" display exynos 5 GS4 will be in full rumor mill mode around what, March? Granted it won't be released till summertime, but I'd armchair guess we'll see 128Gb cards pop up at the beginning of the year. They'll be $200 though lol.
i don't no, but i think no.

[Q] Help choosing Micro SD card

Hi,
I want to install a new ROM in my TF700, with ROM2SD/DATA2SD and for that I am going to buy a Micro SD card.
The thing is I do really want to buy the fastest Micro SD card possible, but I don't understand the all variety of Micro SD card models/specs.
Can someone suggest me some micro sd cards (32GB?) that will be compatible and fast with TF700?
I have both the Scandisk Ultra UHS class 10 and the Samsung Evo.
I get better write speeds (and performance on data2sd) on the Samsung Evo UHS class 10.
The Samsung Pro also works well.
Forget those that promise 90mbs or more - IF the card actually gets that speed other than in an optimal test environment at the manufacturer, our CPU would become the bottleneck...
Make sure you buy from a reputable source and if from Amazon not the "frustration free packaging". It's disgusting how many fakes are sold out there....

Which microSD card for Honor 6?

Hello,
I apologize if this question has already been made but I have a little concerns regarding this matter.
I recently bought the Honor 6 online and I'll receive it soon. I'd like some advice for buying a microSD card that meets my needs.
I'd like to buy a 64gb card that is fast enough (mainly for music and also apps), so I'd avoid cheap cards (unless you assure they're more than ok).
I've made some researches and I'm a bit confused about few points.
What do I really need to check in a card? Is it true that for mobiles the most important thing to see in a sd card are the random Read/Write (512K) speeds? Or else I need to check its sequential speed?
According to a lot of speed tests, SanDisk Extreme Pro is one of the fastest sd cards out there but I also read that SanDisk cards have a quite high failure rate after few months of use (true or not?). Being expensive I've no idea if it would be worth or not.
There are also Samsung Pro+, Transcend 633x, Lexar 1033x etc.. They are quite expensive in Europe and I've totally no idea if my future Honor 6 will be able to benefit to all their fast speed.
I've read this review http://www.anandtech.com/show/8425/huawei-honor-6-review/9 and I'm a bit concerned what the reviewer wrote about the Honor 6, I quote the exact text:
"The Honor 6 offers also a microSD card slot in case you want to expand your storage. The OS offers full exFat compatibility and I had no issues with my Samsung Pro 64GB card. I was however disappointed to see that the HiSilicon chip suffers from the same limitation that plagues other SoCs for no good reason: the DWMMC controller in charge of the SD-card is limited to SDR50 speeds, meaning that you won't be able to exceed ~35mB/s transfer speeds on your microSD, no matter how fast it actually is. It still baffles me that OEMs refuse to address this even almost 2 years after the first UHS-1 cards have been made widely available. "
Is this actually true?
Which microSD you recommend me?
ziovelvet said:
Hello,
IWhich microSD you recommend me?
Click to expand...
Click to collapse
Clearly UHS-1 card is the best balance between performance and cost. According to your research.
.

Which max SD card speed is supported by XZP?

Dear forum,
I want to know if XZP is able to support UHS-II speeds for the SD card. I'm thinking in acquire this one Samsung 64Gb but it's just UHS-I. This will be OK to save 4k video without problems?
I don't want to buy a UHS-II card (which are notabily more expensive) if the phone only supports UHS-I speeds...
Thank you! Regards!
The phone supports only UHS-I speeds, and it will never support UHS-II. You can still buy an UHS-II card if you want, since they are backwards compatible, but you will be capped at the UHS-I speeds. No phone and phone chipset have implemented UHS-II support yet.
Where did you learn about the UHS-I?
Artyomska said:
The phone supports only UHS-I speeds, and it will never support UHS-II. You can still buy an UHS-II card if you want, since they are backwards compatible, but you will be capped at the UHS-I speeds. No phone and phone chipset have implemented UHS-II support yet.
Click to expand...
Click to collapse
How did you learn that it only supports UHS-I? I can't find any information other than "SDXC supported". So, in theory it can hold up to 2TB, but where did you learn about the UHS-1?
I've found this thread a little bit late, but for all followed user: The Generation 2 need a second raw of contacts. If the phone has only one raw, it could not support Gen. 2
Not sure, but I have one wich writes up to 90MB/s and reads up to 100MBs (Samsung EVO Plus U3 SDXC I 256GB) (tested in PC) and from SD to internal (reading) I've seen 80MB/s and from internal to SD (writing) most times is about 50MB/s but sometimes it gets higher, not sure if its a limitation or just the pone was busy and the reading speed from internal was slower than it can be
Anyway I doubt it gets much faster with better SD, and that one is actually cheap comparing with others
work with v30 for 4k
UHS Speed Class 1 designates the performance option designed to support real-time video recording with a UHS-enabled host device. UHS Speed Class 3 designates the performance option designed to support real-time video recording with a UHS-enabled host device.
go here https://www.sandisk.com/about/legal/hd
@prodigalgypsy https://www.qualcomm.com/products/snapdragon-835-mobile-platform
As you can see in the spec sheet, the 835 mobile platform supports .
UFS: UFS2.1 Gear3 2L
SD: SD 3.0 (UHS-I)
So UHS-I speeds are the highest you can get.

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