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From: Pancho <Pancho.Jones@proton.me>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Pi5 M.2 HAT
Date: Wed, 30 Oct 2024 22:07:38 +0000
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On 10/30/24 08:50, Andy Burns wrote:
> Pancho wrote:
> 
>> The official NVMe Pi Hat has been out for months,
> 
> Oh, I don't have a Pi5, and though I kept hearing about 3rd party NVMe 
> HATs and lack of official one
> 

OK, I see there is a story about rPi launching actual NVMe M.2 SSDs. As 
opposed to a hat. I've no idea why they would do that. The obvious 
suspicion is cashing in on a brand name.

<https://www.techpowerup.com/328021/raspberry-pi-launches-nvme-m-2-ssds-and-ready-to-use-ssd-kits>

It's hard to know what is going on with the Raspberry Pi guys, the 
RK3588 devices are clearly faster, lower energy, albeit with shit 
software support. Who knows what will happen with the next generation 
Arm SoCs. I guess maybe Raspberry Pi have a clue, and hence decided to 
monetise the brand now, before a new product wipes the floor with them.

>> I guess I should get one, or maybe an alternative. I just bought a 
>> NVMe USB enclosure which has appalling performance
> 
> Anyway, is it likely the write speeds are faster than the  read speeds? 
> I know some enterprise SSDs come in "read mostly" or "write mostly" 
> flavours, but for a Pi?

Dunno, IOPS doesn't mean a lot to me. As TNP says, maybe a write 
operation is to cache, and a read is from main memory.

On many solid state persistence devices you see a very fast initial 
write (presumably to cache) before quickly settling down to a much lower 
rate for big files.