On 20/03/2021 14:29, Tauno Voipio wrote:
> On 19.3.21 23.03, Craig Dooley wrote:
>> BY: mm0fmf(3:770/3)
>>
>>
>> m> I've used Pi's since as soon as I could buy them but I've never run
>> one
>> m> 24/7 before so I'd like to ensure I've done sufficient to maximise SD
>> m> Card life.
>> m>
>> Not sure what Pi you have, but if it's a 4, have you thought about
>> going with
>> USB instead of SD card?  I've currently got my BBS running on a RPi 4
>> with
>> everything on a USB drive.  128 GB flash drive the size of my
>> thumbnail plugged
>> into one of the USB 3.0 ports.  Works fine, and I don't have to worry
>> about
>> read/write cycles.
>>
>> -Craig
>>
>
> I'm just curious: What makes a Flash memory on an USB interface
> more durable than a Flash memory on a SD card?
>

I don't know.

My day job is writing semiconductor models  (think QEMU-like). We've
done loads of NAND, NOR, UFS, eMMC, SdCard/MMC device and controllers,
MobileStorage, NVMe models for our customers with varying levels of
realism. Our customers have never been keen to discuss wear levelling,
it's considered commercially confidential by them and isn't released
even under NDA.

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