Why Sony limits SD card speed to about 30 MB/s?

[ds2mph]

SanDisk Extreme Pro 400GB V30 A2 (read write speeds up to 170/90) gets only about 30MB/s on the Xperia 1. (Tested via A1 SD Bench)

Why SD Card speed is limited to 30MB/s?

It seems All Xperia flagships (excluding Xperia XZ Premium,XZ1,XZ1 Compact) have this limitation.

/t5/Xperia-XZ2/2018-Phone-SD-Card-limited-to-18MB-s/td-p/1319383#gref

[Uliwooly]

@ds2mph 

which app are you using to test the speed?

[ds2mph]

A1 SD Bench

[Avril]

buddy xzp got this bugs too...  

 i use samsung    /t5/Xperia-XZ-Premium/Sony-Xperia-XZP-received-Mar-amp-Apr-2019-security-patches-quot/td-p/1370977

[azzido]

Any answer from sony mobile engineer on this topic? 

[Sony4KFoneLvr]

Sony, can you respond? For a 4K display phone, it should allow fast speed. Thanks 

[azzido]

Maybe they do not limit it but use cheap reader in X1

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@Sony4KFoneLvr wrote:

Sony, can you respond? For a 4K display phone, it should allow fast speed. Thanks 

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[ds2mph]

https://forum.xda-developers.com/xperia-xz2/how-to/micro-sd-read-write-speed-t3783000/page7

https://forum.xda-developers.com/showpost.php?p=78870686&postcount=436

So, it is a software limitation...

Can be fixed by software update..

But as always, Sony mobile will never fix this problem.

[pressefr]

Wouldn't the larger the SDcard, 400GB, the slower the write speed. It's the card vs the phone. No?

For example when I switched to 4K video option it asked if I want to use internal memory. Since a 64GB Ultra cards are made for recording 4K for it's faster write speeds.

I have my own small issues; I currently use a 400GB SDcard. Once and a while when I pull out my phone to take a picture I get an error like 1/4 times randomly my Xperia 1 can't read my SDcard. I partly think it's to large for a its own good.

https://www.androidpolice.com/2019/02/13/sandisk-a2-and-400gb-microsd-roundup-review-buy-for-storage...