Why not use SD Card Class 10 UHS-1?

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Re: Why not use SD Card Class 10 UHS-1?

Postby Delibit » Fri Jan 24, 2014 7:15 am

What speed would I be getting using right class 4 or 6 card?

My sd card wont mount anymore after installing kitkat 4.2 onto it in nativesd. Any relation with this?

update: my card has failed but windows doesnt report nor does minitool. Both operate but the disk doesnt write anymore. Twrp reports not being able to mount. It still reads however. Maybe it will fix itself *crosses fingers*
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Re: Why not use SD Card Class 10 UHS-1?

Postby zcc » Mon Apr 28, 2014 6:31 pm

tytung wrote:In my experience, it might be the Recovery issue that causes the DSP manager and ringtones missing. Files are there but the size is zero.
Try to change or reflash the Recovery.


AHAAA. Now I understood why I was suffering with the ringtones and DSP manager. I was and still using SanDisk Ultra microSDHC UHS-I 32GB. I also faced the same 0KB file size for ringtones and notifications.
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Re: Why not use SD Card Class 10 UHS-1?

Postby Damnkklly » Fri May 16, 2014 11:02 am

I used it for 2 years, very good!
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Re: Why not use SD Card Class 10 UHS-1?

Postby DoctorG » Fri Oct 10, 2014 10:58 pm

FWIW, a lot of posts would seem to imply that the HD2 is "unique" in its tendency to have problems with UHS-1 cards. The fact is, a lot of devices have issues with these "high performance" cards. Mostly when it comes to ROMming, but there are some phones and tablets that don't like UHS cards even when it comes to just plain storage (i.e., simply using the card to store photos, video, music, etc.). For example, I was using an SD-card ROM with my Nook HD+ tablet, booting the system from a Sandisk 16GB UHS1 "Ultra". Everything seemed to be working fine, and then after a few days things started to go wacky. A little digging on the forums indicated that other people were having problems with that card (which happens to be very popular). So I switched over to another non-UHS card, and sure enough, all my problems went away. So, one shouldn't think that this is somehow a limitation suffered only by the HD2, just because it's an older phone. As I've said, a lot of newer devices don't play nice with UHS either.

My own rule of thumb is that I don't use UHS-1 cards with ANY device, EXCEPT for digital photography equipment. (And for this specific application, I use them exclusively)
Cameras are designed to take advantage of the lofty sustained write speeds these cards offer, and clearly benefit from them. But I have seen virtually NO benefit to their use in phones or tablets, either for ROM use or for general storage. For these devices there is almost no upside to using them, and they often cause headaches (as the numerous forum posts will attest to).

Now, there is no shortage of people on the boards who hold strong opinions about what the best card is for ROM purposes, but for anyone who's interested I'll throw in my 2 cents: The Samsung Class 6 (in 16GB or 32GB capacity) has never let me down, either in speed or reliability. I managed to get my hands on one recently, and for those who are into numbers, here are Crystal Disk specs...
MicroSD - Samsung 32GB CL6
Tested on ASUSGARS, 2014-09-14, internal card reader
-----------------------------------------------------------------------
CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.296 MB/s
Sequential Write : 15.858 MB/s
Random Read 512KB : 18.993 MB/s
Random Write 512KB : 17.620 MB/s
Random Read 4KB (QD=1) : 4.089 MB/s [ 998.2 IOPS]
Random Write 4KB (QD=1) : 2.148 MB/s [ 524.3 IOPS]
Random Read 4KB (QD=32) : 4.272 MB/s [ 1043.1 IOPS]
Random Write 4KB (QD=32) : 2.055 MB/s [ 501.7 IOPS]

Test : 1000 MB [G: 0.0% (0.0/29.3 GB)] (x3)
Date : 2014/09/15 1:42:00
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)

As you can see, the card is a monster. This is a Class 6, yet across the board it blows the doors off even most Class 10 cards. [It even out-classes my Sandisk 'Ultra' UHS1 card, in every metric except for Sequential Read and 512KB Random Read] But most important, are the exceptional read/write speeds for 4KB file sizes. This is probably the most important metric when it comes to ROM performance, e.g., in Native-SD or Data on EXT scenarios. The only "problem" that exists with this card is that Samsung has discontinued production, so they've become harder and harder to find, and when they are available you usually have to pay up. :(
But if you should ever have an opportunity to purchase one (from a reputable source), DO NOT hesitate!
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Re: Why not use SD Card Class 10 UHS-1?

Postby marmagas » Wed Feb 10, 2016 11:27 am

DoctorG wrote:FWIW, a lot of posts would seem to imply that the HD2 is "unique" in its tendency to have problems with UHS-1 cards. The fact is, a lot of devices have issues with these "high performance" cards. Mostly when it comes to ROMming, but there are some phones and tablets that don't like UHS cards even when it comes to just plain storage (i.e., simply using the card to store photos, video, music, etc.). For example, I was using an SD-card ROM with my Nook HD+ tablet, booting the system from a Sandisk 16GB UHS1 "Ultra". Everything seemed to be working fine, and then after a few days things started to go wacky. A little digging on the forums indicated that other people were having problems with that card (which happens to be very popular). So I switched over to another non-UHS card, and sure enough, all my problems went away. So, one shouldn't think that this is somehow a limitation suffered only by the HD2, just because it's an older phone. As I've said, a lot of newer devices don't play nice with UHS either.

My own rule of thumb is that I don't use UHS-1 cards with ANY device, EXCEPT for digital photography equipment. (And for this specific application, I use them exclusively)
Cameras are designed to take advantage of the lofty sustained write speeds these cards offer, and clearly benefit from them. But I have seen virtually NO benefit to their use in phones or tablets, either for ROM use or for general storage. For these devices there is almost no upside to using them, and they often cause headaches (as the numerous forum posts will attest to).

Now, there is no shortage of people on the boards who hold strong opinions about what the best card is for ROM purposes, but for anyone who's interested I'll throw in my 2 cents: The Samsung Class 6 (in 16GB or 32GB capacity) has never let me down, either in speed or reliability. I managed to get my hands on one recently, and for those who are into numbers, here are Crystal Disk specs...
MicroSD - Samsung 32GB CL6
Tested on ASUSGARS, 2014-09-14, internal card reader
-----------------------------------------------------------------------
CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 19.296 MB/s
Sequential Write : 15.858 MB/s
Random Read 512KB : 18.993 MB/s
Random Write 512KB : 17.620 MB/s
Random Read 4KB (QD=1) : 4.089 MB/s [ 998.2 IOPS]
Random Write 4KB (QD=1) : 2.148 MB/s [ 524.3 IOPS]
Random Read 4KB (QD=32) : 4.272 MB/s [ 1043.1 IOPS]
Random Write 4KB (QD=32) : 2.055 MB/s [ 501.7 IOPS]

Test : 1000 MB [G: 0.0% (0.0/29.3 GB)] (x3)
Date : 2014/09/15 1:42:00
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)

As you can see, the card is a monster. This is a Class 6, yet across the board it blows the doors off even most Class 10 cards. [It even out-classes my Sandisk 'Ultra' UHS1 card, in every metric except for Sequential Read and 512KB Random Read] But most important, are the exceptional read/write speeds for 4KB file sizes. This is probably the most important metric when it comes to ROM performance, e.g., in Native-SD or Data on EXT scenarios. The only "problem" that exists with this card is that Samsung has discontinued production, so they've become harder and harder to find, and when they are available you usually have to pay up. :(
But if you should ever have an opportunity to purchase one (from a reputable source), DO NOT hesitate!

Hi there,the you are referring to is this one? http://www.amazon.co.uk/gp/product/B00J ... _ya_signin
Thanks!
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