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Date: Tue, 18 Feb 2025 00:12:59 +0100
From: Frank Steinmetzger <Warp_7@gmx.de>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Re: problem formatting new 256 GB USB stick
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Am Sun, Feb 16, 2025 at 01:41:10PM +0000 schrieb Michael:
> On Sunday 16 February 2025 09:08:10 Greenwich Mean Time Nuno Silva wrote:
> > On 2025-02-16, Philip Webb wrote:
> > > 250215 Michael wrote:
>=20
> > >> Formatting a 256GB USB drive, especially if it is a USB 3.0 or later
> > >> spec, should not take hours, but minutes if not seconds.
> > >=20
> > > See listing below.  My notes tell me that in many previous cases,
> > > it has taken these rates to format :  2 :  6 min/GB  ; 3 :  1,8 min/G=
B ;
> > > today, it took  2 h 51 m  to format a  64 GB  partition (mainly inode=
s).
>=20
> I just formatted a USB 2.0 8GB stick with mke2fs as a test.  It took 46=
=20
> seconds.  Extrapolating for your 64GB partition it should take ~ 6 minute=
s.  A=20
> full 256GB drive would take 24.5 minutes.  I expect a drive enjoying USB =
3.0=20
> transfer speeds to take way less than this.

Your expectations have some vague assumptions:
- the stick achieves full speed of its USB protocol
- it keeps that throughput over time
- the data written grows linearly with the FS size

USB sticks often have a bad thermal design and throttle down once they get=
=20
hot. And hot they get, especially the high-speed ones.

If you are curious, use a program like dool or glances to observe the=20
device=E2=80=99s actual write throughput during formatting. htop can show t=
his, too,=20
but you first need to add a display meter in its config.

--=20
Gr=C3=BC=C3=9Fe | Greetings | Salut | Qapla=E2=80=99
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