NexusHD2 Android Forum

Dear all,

Can anyone explain why not use SD Card Class 10 UHS-1?

@tytung: can you give me more detail please. Thank you very much.

I will appreciate your help with this situation.

tytung wrote:NativeSD (Everything on the SD card)
For high speed read/write SD Card only (Class 6 or 10) (Don't use a class 10 UHS-1 card). Otherwise you may get poor performance.

Based on my use of a SanDisk 32gb UHS-1 card, the HD2 SD card hardware/software interface appears to be incompatible with UHS-1. I don't know if the issue is voltage levels, hardware timing or kernel driver code. The result is random failures to correctly write a sector, which later manifests as some random program anomaly or crash. This quickly becomes very frustrating. When I used the UHS-1 card, I was ready to completely give up on NativeSD as no distribution I tried was stable for any length of time.

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NVXkS0bVrkGl6 wrote:Dear all,

Can anyone explain why not use SD Card Class 10 UHS-1?

@tytung: can you give me more detail please. Thank you very much.

I will appreciate your help with this situation.

It's based on user feedback and experiences.
Besides, I remembered that the kernel developer, Securecrt , ever updated the SD card driver in the kernel to recognize/support a Class 10 UHS-1 SD card, but he didn't succeed so far. Maybe it's related to the HD2 hardware limit.

Anyway, don't use a Class 10 UHS-1 SD card in order to avoid any strange issues.

agbommarito wrote:...I don't know if the issue is voltage levels, hardware timing or kernel driver code...

tytung wrote:...Besides, I remembered that the kernel developer, Securecrt , ever updated the SD card driver in the kernel to recognize/support a Class 10 UHS-1 SD card, but he didn't succeed so far...

Thank you very much.

Everything is clear. Some of my friends advise me to use Toshiba EXCERIA. I'll explain to them.

It's working without any problem when you flashing via nand+data on ext4

Sent from my NexusHD2 using Tapatalk

I'm use sandisk class 10 uhs-1

Sent from my NexusHD2 using Tapatalk

I must have been changed at least 6 sd cards. When I flash everything that has to do with sd card, thing start to fall appart after awhile. Every single card used shows miserable 4k write values. Then I put Samsung class 6(with blue letters) and it was OK, no gapps fc and simmilar stuff, really stable. But Samsung plus series SD card(orange letters, and yes, this is UHS card, class 10) is even better. You can go with pro series but it's a waste of money. And with TWRP can't get properly aligned partitions, clean up the card and use 4ext recovery and you can check the alignment also. Off, course one can have several recoveries with CLK, put TWRP extended in real recovery partition on NAND, make folder inside NativeSD on fat partition, and name it recovery or something. Transfer zimage and initrgz stuff from 4ext recovery and within TWRP, update kernel from NativeSD tools menu and choose boot partition(sboot, tboot...), just make sure it's big enough.

tytung wrote:It's based on user feedback and experiences.
Besides, I remembered that the kernel developer, Securecrt , ever updated the SD card driver in the kernel to recognize/support a Class 10 UHS-1 SD card, but he didn't succeed so far. Maybe it's related to the HD2 hardware limit.

Anyway, don't use a Class 10 UHS-1 SD card in order to avoid any strange issues.

Hi everyone,

according to numerous posts, replies, threads about this topic, kindly explain WHAT SD card will be the best for the EUR Version of HTC HD2?
I am planning to purchase a http://www.amazon.de/SanDisk-Ultra-microSDHC-Class-Speicherkarte/dp/B007JTKLEK . Or should i prefer to use a class 6? What about 64GB cards??? Thanks

Hi all members of xda, thanks tytung for the great ROM. I have use UHS-1 SD card sandisk 16gb longtime. Now I'm using tytung KitKat ROM, in my experience if I flashing rom via native sd it seems like have a problem especially the DSP manager always missing,but sound is working and cannot change your ringtone, but I'm always use nand+data on ext4 and everything is so far no problem.

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tudau wrote:Hi all members of xda, thanks tytung for the great ROM. I have use UHS-1 SD card sandisk 16gb longtime. Now I'm using tytung KitKat ROM, in my experience if I flashing rom via native sd it seems like have a problem especially the DSP manager always missing,but sound is working and cannot change your ringtone, but I'm always use nand+data on ext4 and everything is so far no problem.

Sent from my NexusHD2 using Tapatalk

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.