Re: [gentoo-user] Re: problem formatting new 256 GB USB stick

[Frank Steinmetzger <Warp_7@gmx.de>]

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Am Tue, Feb 18, 2025 at 11:53:48AM +0000 schrieb Michael:

> > Your expectations have some vague assumptions:
> 
> Yes, I was just trying to point loosely at the order of magnitude as an 
> indication of something being faulty in the USB Philip was trying to format.
> 
> > - the stick achieves full speed of its USB protocol
> 
> I haven't yet found a USB stick which reaches the maximum USB protocol speeds.  
> The old USB 2.0 stick I used will not go above 11-12MBps during large writes 
> and around twice as fast on sustained reads, well below the advertised USB 2.0 
> speed of 60MBps.

I’ve never seen more than 40 MB/s, also with USB 3.0 HDDs attached to a 2.0 
port.

> > - it keeps that throughput over time
> 
> Once buffers are saturated write operations will settle at what the device can 
> achieve.  I have observed writes slow down when the empty space left is 
> getting low. 

Which buffer? Sticks don’t generally have one, let a lone an equivalent to 
an SSD’s SLC cache. I guess you mean the host’s cache?

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