linux-ext4 - Do sparse files save HDD-space and are the blocks in random order?

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Message-ID: <4f779284d797f468d715da19ec04fc1d7939e799.camel@gmail.com>
Date: Sat, 11 Jan 2025 09:16:30 +0100
From: Andreas Wagner <andreasw3756@...il.com>
To: linux-ext4@...r.kernel.org
Subject: Do sparse files save HDD-space and are the blocks in random order?

Hello,

I have two questions on sparse files:

1. Do they really - as media suggests - reduce filesize if the file is
sparse?
2. Are the blocks of the file in random order?

Thanks in advance and regards,
Andreas Wagner