78 lines
2.7 KiB
Diff
78 lines
2.7 KiB
Diff
From 21be64fc6ef60a1e9dc7bc352131be58cc59d61d Mon Sep 17 00:00:00 2001
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From: Jim Meyering <jim@meyering.net>
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Date: Wed, 2 Jan 2013 12:52:14 +0100
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Subject: [PATCH 49/89] doc: 1MiB-alignment is not enough for cheap flash
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drives
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* doc/parted.texi: Add an example that aligns to 4GiB, and
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reference Arnd Bergman's LWN article.
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---
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doc/parted.texi | 39 ++++++++++++++++++++++++++++++++++-----
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1 file changed, 34 insertions(+), 5 deletions(-)
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diff --git a/doc/parted.texi b/doc/parted.texi
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index b8db19d..008c383 100644
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--- a/doc/parted.texi
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+++ b/doc/parted.texi
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@@ -14,7 +14,7 @@ and manipulating partition tables.
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@ifnottex @c texi2pdf don't understand copying and insertcopying ???
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@c modifications must also be done in the titlepage
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@copying
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-Copyright @copyright{} 1999-2012 Free Software Foundation, Inc.
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+Copyright @copyright{} 1999-2013 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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@@ -577,15 +577,44 @@ partition table.
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@item ufs
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@end itemize
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-Example:
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+For example, the following creates a logical partition that will contain
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+an ext2 file system. The partition will start at the beginning of the disk,
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+and end 692.1 megabytes into the disk.
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@example
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(parted) @kbd{mkpart logical 0.0 692.1}
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@end example
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-Create a logical partition that will contain an ext2 file system. The
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-partition will start at the beginning of the disk, and end 692.1
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-megabytes into the disk.
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+Now, we will show how to partition a low-end flash
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+device (``low-end'', as of 2011/2012).
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+For such devices, you should use 4MiB-aligned partitions@footnote{
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+Cheap flash drives will be with us for a long time to
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+come, and, for them, 1MiB alignment is not enough.
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+Use at least 4MiB-aligned partitions.
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+For details, see Arnd Bergman's article,
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+@uref{http://http://lwn.net/Articles/428584/} and its many comments.}.
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+This command creates a tiny place-holder partition at the beginning, and
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+then uses all remaining space to create the partition you'll actually use:
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+
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+@example
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+$ @kbd{parted -s /dev/sdX -- mklabel msdos \}
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+@kbd{ mkpart primary fat32 64s 4MiB \}
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+@kbd{ mkpart primary fat32 4MiB -1s}
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+@end example
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+
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+Note the use of @samp{--}, to prevent the following @samp{-1s} last-sector
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+indicator from being interpreted as an invalid command-line option.
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+The above creates two empty partitions. The first is unaligned and tiny,
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+with length less than 4MiB.
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+The second partition starts precisely at the 4MiB mark
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+and extends to the end of the device.
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+
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+The next step is typically to create a file system in the second partition:
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+
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+@example
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+$ @kbd{mkfs.vfat /dev/sdX2}
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+@end example
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+
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@end deffn
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--
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1.8.5.3
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