A2-class microSD cards offer no better performance for the Raspberry Pi
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Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#2Testing microSD card speed on a Mac is rather pointless because performance is (severely) limited on the Raspberry Pi through it's terribly slow interface, not necessarily the actual card.
Remember RPi 1-3 use a plain SPI interface, and even the new 4 only has UHS-1.
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#3The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd.
Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#4I appreciate you doing these tests, this (and your last article) instantly answers my question about "how will this perform in one of my rpis?". Please keep doing them as new cards(with their marketing claims) are introduced!
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#5The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd. Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
That'd be an interesting feature to see but I'm sure it'd also really run up the board cost...
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#6The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd. Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
Would be nice to see an NVMe slot on one of these things. I’m guessing there aren’t even enough PCI Express lanes on RPi 4 to do that today.
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#7The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd. Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
That'd be an interesting feature to see but I'm sure it'd also really run up the board cost...
rockpi 4A is $39 and has an m.2 slot
https://shop.allnetchina.cn/collections/frontpage/products/r...
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#8Testing microSD card speed on a Mac is rather pointless because performance is (severely) limited on the Raspberry Pi through it's terribly slow interface, not necessarily the actual card. Remember RPi 1-3 use a plain SPI interface, and even the new 4 only has UHS-1.
I have no idea what your point is. Testing on a mac is pointless because RPi performance is limited?
Except the article showed the exact same performance in both places.
It started with: Why don't these cards designed for things like RPi actually show any improvement? Oh, they don't show improvement on any device at all, they are full of crap.
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#9The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd. Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
Exactly, who cares about speed when all the microSD cards I try eventually become corrupt due to poor controller logic.
Re: A2-class microSD cards offer no better performance for the Raspberry Pi
#10The major problem is not disk write speed, which we can all agree sucks, but longevity and lifespan when used as a system boot disk and also containing /var and similar. The write wear leveling on a u3 microsd card is nowhere near as good as even a $50 consumer class ssd. Small single board computers should move towards m.2 2280 nvme drive support, or at least one sata 6 gbps interface.
Given the market segment, theoretical longevity and lifespan are not a concern - both on the producer side, who has to put more expensive chips, and on the consumer side, who has to pay for the chips and the media (SD cards are extremely cheap).
Moving up in the market segnment there are in fact higher-end solutions:
- the Odroid XU4 has an eMMC port (for those who want a compact solution but don't care
about long-term durability)
- again, the XU4 supports a SATA bridge
- the Odroid has both eMMC and SATA ports