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Tips & Tricks

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2018 Phone - SD Card limited to 18MB/s

Adviser
Message 1 of 15
4,070 Views
Message 1 of 15

2018 Phone - SD Card limited to 18MB/s

Samsung Pro 128GB (95/90 R/W) will only get 18MB/s write speed on the Xperia XZ2 / XZ2 Compact. Spoke to support and they state its a 'hardware limitation'!!.

 

Surely this kills 4k HDR recording via SD card which is what Sony market these new phones as being capable of??

14 REPLIES 14
Moderator
Message 2 of 15
4,013 Views
Message 2 of 15

Re: 2018 Phone - SD Card limited to 18MB/s


@Jez_Jwrote:

Samsung Pro 128GB (95/90 R/W) will only get 18MB/s write speed on the Xperia XZ2 / XZ2 Compact. Spoke to support and they state its a 'hardware limitation'!!.

 

Surely this kills 4k HDR recording via SD card which is what Sony market these new phones as being capable of??


No, it's more than fast enough at 18MB/S sustained write.

18MB/S provides a video bitrate speed of 144mbps which is well above the bitrate needed for 4k recording even using HLG 



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Learner
Message 3 of 15
3,915 Views
Message 3 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

The problem is that other phone companies do not have such a limit on micro SD card speeds. What about Sony's hardware creates this limit. 18mps is okay for video if consistent but it is not great for everyday usage. 

 

I would like to know why they limited the speed.

Moderator
Message 4 of 15
3,909 Views
Message 4 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

What scenario is displaying this 18MB/S write speed?

What is your EXACT card?

Where has this card been used prior at a higher speed?

 

 



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Click here to find out more about the different roles on the community.

Apprentice
Message 5 of 15
3,837 Views
Message 5 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

I have the same issue.
I'm using Sanddisk Ultra 64GB, They have claimed read speed up to 100MB/s.
But when i tested on Xperia XZ2 is limited at 18 MB/s. by using application "A1 SD Bench".

For the other devices i'm quite sure is not limited at  18 MB/s at least 40 MB/s or more. 

Inhabitant
Message 6 of 15
3,765 Views
Message 6 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

As I read on the XDA: https://forum.xda-developers.com/showpost.php?p=76526411&postcount=13

It seems to be platform limitation, not just Sonys choice?

Not sure what sharing bandwith between SD and SIM means, but there may be something like that.

Adviser
Message 7 of 15
3,755 Views
Message 7 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

Well, just flashed my phone with the Android P beta, sd speed now is 31.57MB/s read and 28.05MB/s write on a Samsung 128GB Evo Plus. Not tested the Samsung Pro yet, but the speed restriction was software related  (possibly due to Oreo formatting as exFat, Android P is fat32).

 

So not a 'hardware limitation' at all.....

 

Apprentice
Message 8 of 15
3,744 Views
Message 8 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

Seems Xperia XZ1 and Xperia XZ2 are have none the issues.
I'm so disappointed. If It puts limited to micro SD card bandwidth. Especially when i browse to my pictures in sd card. It feels slow to me.

XZP
33183021_221126305147964_4786876974222016512_o.jpg


XZ1
33132491_1774837935899174_7635134345300148224_o.jpg

Inhabitant
Message 9 of 15
3,703 Views
Message 9 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

@ZoroUrchin

What SanDisk claims is rounded read speed, not write one.

 

One question about Your benchmarks - the upper is XZ2, lower XZ1? And why there is 0,00 MB/s? Maybe something wrong with the app, coz Sony changed something (connection of memories and SoC (it acts as chipset?))?

Apprentice
Message 10 of 15
3,686 Views
Message 10 of 15

Re: 2018 Phone - SD Card limited to 18MB/s

@ch3mn3y What I meant is about the read speed issue. I've attached my device result.
The write speed is hit to standard of class 10/U1 specification. But i didn't test with U3/V30 standard if there limited brandwidth or not.
33030356_10157047617078273_5938715099098251264_n.jpg

About the question 
All thorse picture i took it from Xperia community.  The first picture is XZP tested with samsung evo+ 128Gb. And on below is XZ1 tested with Sandisk Extream Pro.
So to the write 0.00 MB/s I think the person who did it hasn't grant a write access permission to application correctly. So that it just can't benckmark write speed.