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Add block size to dd command

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Without configuring the block size a default of 512 bytes is used, which can
slow down the transfer speed massively.

In a test I've done with a semi-decent USB stick, I only get a transfer speed
of around 180 KB/sec when not specifying the block size but see 27 MB/sec when
setting the block size to 1 MB. This makes the transfer of the minimal
installation ISO take half a minute instead of an hour.
This commit is contained in:
Jeppe Fihl-Pearson 2022-03-30 21:07:20 +01:00 committed by Bjørn Forsman
parent eeb3206a29
commit b5f36e84d1
2 changed files with 2 additions and 2 deletions
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2
nixos/doc/manual/from_md/installation/installing-usb.section.xml
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@ -17,7 +17,7 @@ $ diskutil list
[..]
$ diskutil unmountDisk diskN
Unmount of all volumes on diskN was successful
$ sudo dd if=nix.iso of=/dev/rdiskN
$ sudo dd if=nix.iso of=/dev/rdiskN bs=1M
</programlisting>
<para>
Using the 'raw' <literal>rdiskN</literal> device instead of

2
nixos/doc/manual/installation/installing-usb.section.md
View file

@ -18,7 +18,7 @@ $ diskutil list
[..]
$ diskutil unmountDisk diskN
Unmount of all volumes on diskN was successful
$ sudo dd if=nix.iso of=/dev/rdiskN
$ sudo dd if=nix.iso of=/dev/rdiskN bs=1M
```
Using the \'raw\' `rdiskN` device instead of `diskN` completes in