smith110
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SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 7:33 am

Subject
A2 support in Linux kernel

Response By Email (Noah G.) (07/15/2019 05:46 PM)
Dear Mr. Smith,

I understand you would like to know if we are planning on updating the Linux Kernel for A2 microSD support.

Kindly note that Linux is currently not supported by SanDisk® so we do not have any information to provide regarding your question.

Additionally we do not support the usage of retail SanDisk products with devices such as Raspberry Pi’s as these devices perform constant read and write operations that wear out the memory of our products a lot faster eventually voiding the warranty.

Our products are meant to be used as simple storage devices.

For future reference, please note that when it comes to using Raspberry Pi’s or other similar devices (Surveillance or Dashcameras), due to the excessive and continuous reading and writing, we recommend using a different card model, specifically designed for this host device, the High Endurance card. Any other card will not be able to cope with the continuous data transfer and as a result will be worn out.

Let us know if you have any further questions or require assistance!

Once your support case is closed, you will receive a 20-second survey regarding our services. We thank you in advance for participating.

Thank you for your interest in SanDisk® products!

Click here to register your product online.

Best regards,

Noah G.
SanDisk® Global Customer Care

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Imperf3kt
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:21 am

That's contrary to other replies from SanDisk I've read where the A# series was the recommended storage device for a Raspberry Pi.

Currently, tests performed by forum members point to A1 being the best card to use with A2 potentially performing worse due to requiring specialised peripherals.
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LTolledo
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:38 am

...all the more it should be avoided like the plague...
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jamesh
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:45 am

Do you have a question, or a comment on this statement from Sandisk? It's not something new.
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HawaiianPi
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 10:10 am

Pretty much all SD card makers will void the warranty for cards used as boot drives in an SBC (with the possible exception of high endurance cards, but even that's uncertain). That's simply not their intended use.

The whole A1 A2 thing is another story. I purchased an A2 card, knowing that my current hardware would not fully support it, but I assumed it would still be at least a little faster than an A1 card. It wasn't.

In every test but sequential write the SanDisk Ultra A1 cards were faster than the SanDisk Extreme A2 card, and since we're comparing an Ultra to an Extreme, the faster write is no surprise. What was a surprise was in sequential read, and random read and write IOPS, the much less expensive A1 cards were faster. Granted, it wasn't a huge difference, but you're getting less performance for more money.

The IOPS was particularly interesting, because I would have thought that would be more about the internal controller than anything external, but that doesn't seem to be the case.

When I contacted SanDisk about this they were very cagey. They would not openly admit that the A2 card could only perform well in specific hardware, but they kept pushing me to buy a particular model of their card reader (which is one of the very few A2 certified products available now). So I ended up returning it and posting a review on Amazon about the A2 card's dirty little secret.

So yea, don't buy A2 cards unless you have a very specific device that is A2 certified. If you already own one and it's too late to return it, don't fret too much because they are still much faster than standard Class-10 cards, and close enough in performance to A1 cards that the difference is probably not human perceptible (perceivable?). You spent a bit more than you needed, but it's still a fast card.
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smith110
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 11:10 am

You are absolutely correct. It seems A2 is only the marketing unfortunately. Even 170MB/s reading performance for SanDisk Extreme Pro seems like tweak of official standards, nothing else. I would propose little more $$ for eMMC in next + version. :-)

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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 11:46 am

smith110 wrote:
Tue Jul 16, 2019 11:10 am
You are absolutely correct. It seems A2 is only the marketing unfortunately. Even 170MB/s reading performance for SanDisk Extreme Pro seems like tweak of official standards, nothing else. I would propose little more $$ for eMMC in next + version. :-)
Why? SD cards work fine. (and eMMC is a similar technology anyway - what happens when that fails, if its built in....)
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smith110
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 12:24 pm

jamesh wrote:
Tue Jul 16, 2019 11:46 am
smith110 wrote:
Tue Jul 16, 2019 11:10 am
You are absolutely correct. It seems A2 is only the marketing unfortunately. Even 170MB/s reading performance for SanDisk Extreme Pro seems like tweak of official standards, nothing else. I would propose little more $$ for eMMC in next + version. :-)
Why? SD cards work fine. (and eMMC is a similar technology anyway - what happens when that fails, if its built in....)

eMMC is not equal SD nowadays. Quite significant progress in eMMC (speeds and implementation).

Look at this: http://events17.linuxfoundation.org/sit ... kernel.pdf

jamesh
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 1:04 pm

smith110 wrote:
Tue Jul 16, 2019 12:24 pm
jamesh wrote:
Tue Jul 16, 2019 11:46 am
smith110 wrote:
Tue Jul 16, 2019 11:10 am
You are absolutely correct. It seems A2 is only the marketing unfortunately. Even 170MB/s reading performance for SanDisk Extreme Pro seems like tweak of official standards, nothing else. I would propose little more $$ for eMMC in next + version. :-)
Why? SD cards work fine. (and eMMC is a similar technology anyway - what happens when that fails, if its built in....)

eMMC is not equal SD nowadays. Quite significant progress in eMMC (speeds and implementation).

Look at this: http://events17.linuxfoundation.org/sit ... kernel.pdf
Still not happening. We are very happy with SD cards.
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LTolledo
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:13 pm

...from where I am, for the same storage capacity, eMMC modules are (prohibitively) more expensive than microSD cards....

I do have some SBCs with eMMC capability, but still uses microSD cards as those are more readily and relatively cheaply available...
just currently sticking to class 10 types, do have some A1, it all depends on use-case. above that SSD is my choice.
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Andyroo

Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:25 pm

Can you imagine the fun if you want to try a new OS or test install a package?

SD - duplicate, swap and try
eMMC - unsolder, swap, resolder, load OS, test

I do wish the full sized SD cards where still in use as I often need tweezers but that’s just my fat fingers :lol:

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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 9:59 pm

Andyroo wrote:
Tue Jul 16, 2019 9:25 pm
Can you imagine the fun if you want to try a new OS or test install a package?

SD - duplicate, swap and try
eMMC - unsolder, swap, resolder, load OS, test
I'm happy with SD cards, but to be fair, removable eMMC modules do exist.

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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 10:07 pm

Andyroo wrote:
Tue Jul 16, 2019 9:25 pm
I do wish the full sized SD cards where still in use as I often need tweezers but that’s just my fat fingers :lol:
ahh... the tweezer method.... I can relate to that....
also tried the trailing tape method as well.... though, if wrongly positioned, you get a stuck microSD card...then its back to the tweezer method again.... :D

just for the fun of it, a year ago I bought a full-sized-SD-card to microSD slot adapter, tried it, it works! (was then tested on RPi3B, RPi1A+, other SBCs)
though I didn't like the long (200mm) ribbon cable that came with it.....
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HawaiianPi
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 11:12 pm

LTolledo wrote:
Tue Jul 16, 2019 10:07 pm
just for the fun of it, a year ago I bought a full-sized-SD-card to microSD slot adapter, tried it, it works! (was then tested on RPi3B, RPi1A+, other SBCs) though I didn't like the long (200mm) ribbon cable that came with it.....
You can get micro SD extenders as well, and even dual slot card switchers, either one of which will stick out of the Pi/case far enough to make access easier.
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Re: SanDisk A2 mode support - worthless, waste of money

Tue Jul 16, 2019 11:39 pm

HawaiianPi wrote:
Tue Jul 16, 2019 11:12 pm
LTolledo wrote:
Tue Jul 16, 2019 10:07 pm
just for the fun of it, a year ago I bought a full-sized-SD-card to microSD slot adapter, tried it, it works! (was then tested on RPi3B, RPi1A+, other SBCs) though I didn't like the long (200mm) ribbon cable that came with it.....
You can get micro SD extenders as well, and even dual slot card switchers, either one of which will stick out of the Pi/case far enough to make access easier.
My Pis in cases get moved around enough that I really prefer not to have stuff sticking out...and the "old timers" will remember all the anguish over dropped Pis getting the full-sized SD card holders broken. Of all the old hardware, what I miss are the "push-push" microSD card holders., though one had to be careful to make sure the card popping out couldn't get away.

Really, the short version is that there is no ideal holder. We get a choice of different fault modes.

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HawaiianPi
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Re: SanDisk A2 mode support - worthless, waste of money

Wed Jul 17, 2019 12:06 am

W. H. Heydt wrote:
Tue Jul 16, 2019 11:39 pm
Really, the short version is that there is no ideal holder. We get a choice of different fault modes.
I have large hands and fingers, but I don't have much trouble getting cards in and out of my Flirc cases, and it's quite easy with the open sided 2 layer acrylic case (since you can actually grip both sides of the card). I know cases designed for the 2B can be a PITA with the 3B, since the 2B had the push in, push out ejection type slot (and 2B cases don't leave a lot of room around the uSD card).

No clue about the official 4B case, because I don't have one and likely won't get one (I have the Flirc 4B case on pre-order).
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