micro SDs card for Pinebook Pro

[wdt]

>wow, 900MB/s
I did say the high speeds sometimes are bogus,,quote,,too high to be believable
I haven't found the switch to fix,, have you?
You will notice that the evo plus speeds seem OK
But this is irrelevant, you are testing to find the BAD or otherwise
The bottom line is: if it is not a fake,, it is hard to beat any evo,
most are worse, sometimes a lot worse
What we need is 3D Xpoint in a uSD

[z4v4l]

I haven't found the switch to fix,, have you?

-I (capital i)? if this isn't supported, then there is no way to fix. but I remember using this test on armbian and it worked.

[dukla2000]

I haven't found the switch to fix,, have you?

-I (capital i)? if this isn't supported, then there is no way to fix. but I remember using this test on armbian and it worked.

Yup it is. See my results below. IIRC the iozone version is relevant, way back working with Thomas Kaiser we worked out some discrepancies were version related.

All tests on my RockPro64.
My 512G Adata SX8200Pro NVMe (not as fast as my Samsung SM981 but a whole lot bigger)

Code:

$ iozone -e -I -a -s 100M -r 4k -r 16k -r 512k -r 1024 -i 0 -i 1 -i 2
Iozone: Performance Test of File I/O
       Version $Revision: 3.429 $
Compiled for 64 bit mode.
...
                                                             random    random     bkwd    record    stride                                    
             kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
         102400       4     3037     6459    90502    95308    33475     6152                                                          
         102400      16    13447    25481   162888   185929    79805    24745                                                          
         102400     512   259171   293960   365909   367490   354627   289705                                                          
         102400    1024   313224   397174   440851   438564   461775   352619                                                          

iozone test complete.

The 16G Foresee eMMC, noted for being among the slower Pine64 eMMC options

Code:

                                                             random    random     bkwd    record    stride                                    
             kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
         102400       4     3107     4210     8153     8144     8085     3817                                                          
         102400      16    16235    17555    30487    31479    31486    17033                                                          
         102400     512    74256    79150   106646   108230   107462    75865                                                          
         102400    1024    80364    79805   115184   114837   114471    79968                                                          

iozone test complete.

My 128G Samsung Evo+

Code:

                                                             random    random     bkwd    record    stride                                    
             kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
         102400       4     2938     3306     9769     9745     6929      662                                                          
         102400      16    10194    16498    25067    25611    24014    15326                                                          
         102400     512    31305    33920    56710    56802    56026    36588                                                          
         102400    1024    21218    21756    58652    58492    58591    22143                                                          

iozone test complete.

And a 32G class 10 micro SD, one of my better no-names! Yup - today (newly formatted & empty) it beat the Evo+ in 4k random writes, mainly as the Evo+ is nearly full so the test file was placed at the end of the disk. On a good day my Evo+ are closer to eMMC performance.

Code:

                                                             random    random     bkwd    record    stride                                    
             kB  reclen    write  rewrite    read    reread    read     write     read   rewrite      read   fwrite frewrite    fread  freread
         102400       4     1747     1883     5885     6012     4622      905                                                          
         102400      16     6921     6628    18878    18789    15132     3420                                                          
         102400     512    22059    25496    58523    58641    57695    19440                                                          
         102400    1024    28415    23058    59517    59920    59362    24839                                                          

iozone test complete.

[Der Geist der Maschine]

The mass-market use of SD-card for linux root started with Raspberry Pi nearly 8 years ago. One of the guys who has done a lot of work to understand their performance is Jeff Geerling. I have put a link to him in the Resources section of the PinePhone software page as well.

TL;DR - Samung Evo+ (and  my 64G is faster than my 32G is faster than my 128G IIRC at 4k writes!)

Getting the Evo+ is almost impossible. It's superseded by the (weaker) Evo Plus. On Amazon, you see quite often pics of the Evo+ but Evo Plus in the description or the other way around. My local store does not sell it.

The situation on newegg was even worse. Pic and description were Evo+, but a reviewer said that was not what he got.


Now A1 and A2 cards are becoming more popular ... but they seem to suck on Linux https://github.com/ThomasKaiser/Knowledg...D_cards.md

The more I know about micro SD cards, the less I know which to buy

[Surehand53]

I use the Sandisk Extreme 32Gb A1 (gold) and am very happy with it.
It is very noticeable faster than my other Sandisk Ultra 32Gb (silver).

Someone mentioned A1 being the sweet spot right now as A2 although more capable is not widely supported by hardware, can’t find the link right now, though.

---

I use the Sandisk Extreme 32Gb A1 and am very happy with it.
It is very noticeable faster than my other Sandisk Ultra 32Gb.

Someone mentioned A1 being the sweet spot right now as A2 although more capable is not widely supported by hardware, can’t find the link right now, though.

[dukla2000]

Someone mentioned A1 being the sweet spot right now as A2 although more capable is not widely supported by hardware, can’t find the link right now, though

---

Jeff Geerling is less polite, he calls the A2 spec marketing bs.

[xmixahlx]

A2 is bs if not using an A2 setup, ya. the samsung evo plus 64GB (and larger) microsd cards are U3. that's what i buy. I get ~60MBps read on this versus ~150MBps for eMMC.