Last modified by Mélodie on 2026/07/11 13:38

From version Icon 3.3 Icon
edited by Mélodie
on 2026/07/11 13:05
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To version Icon 5.1 Icon
edited by Mélodie
on 2026/07/11 13:32
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61 61  {{/code}}
62 62  {{/info}}
63 63  
64 -(% class="wikigeneratedid" %)
65 65  
66 66  
67 67  === 3. Check the partition table type and the presence of signatures ===
... ... @@ -108,7 +108,6 @@
108 108  ##wipefs -a## is preferable to a blind ##dd if=/dev/zero of=/dev/sdX##: the latter overwrites the entire device (slower, riskier if ##count## isn't carefully controlled), whereas ##wipefs## targets precisely the identified signatures, wherever they are on the disk — including a signature at the end of the disk, as in the GPT remnant case mentioned earlier.
109 109  {{/info}}
110 110  
111 -(% class="wikigeneratedid" %)
112 112  
113 113  
114 114  === 6. Force the kernel to reread the partition table ===
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124 124  Without this step, the system may still display a cached state during the next verification, rather than the device's actual state after cleanup.
125 125  
126 126  
127 -=== 7. Verify that the cleanup was effective ===
125 +=== 7. Check effectiveness of the cleanup ===
128 128  
129 129  With administrator privileges:
130 130  
... ... @@ -132,9 +132,25 @@
132 132  blkid -p /dev/sdX
133 133  {{/code}}
134 134  
135 -Shouldn't return anything (or only the device's generic information): a sign that the device is now on a clean footing (##/dev/sdX## should still be adapted).
133 +##/dev/sdX## should still be adapted.
136 136  
135 +Should return nothing (or only the device's generic information): a sign that the device is now on a clean footing.
137 137  
137 +In addition, it's possible to inspect the raw bytes of the first sector directly:
138 +
139 +{{code language="bash"}}
140 +hexdump -C -n 512 /dev/sdX | tail -n 2
141 +{{/code}}
142 +
143 +or, equivalently:
144 +
145 +{{code language="bash"}}
146 +xxd -l 512 /dev/sdX | tail -n 2
147 +{{/code}}
148 +
149 +Once the new partition table has been created, the boot sector's end-of-sector signature (##55 aa##, at bytes 510-511) should be present. This signature is universal: it appears on both a ##dos## table and a ##gpt## table, the latter always starting with a "protective MBR" in the first sector, itself ending with the ##55 aa## signature as well. Its presence is simply an indicator of consistency in the first sector, regardless of the partition table type in use.
150 +
151 +
138 138  === 8. Repartition ===
139 139  
140 140  
... ... @@ -145,7 +145,6 @@
145 145  If the end goal is to install Ventoy on the stick: it is recommended to create the partition table with GParted **before** launching the Ventoy installer, rather than letting it manage the entire disk on its own. This makes it possible to explicitly choose MS-DOS or GPT depending on the target machine, useful for instance when facing a hybrid BIOS/UEFI that will only boot from an MS-DOS table. Ventoy also offers its own option for this choice (##-g## for GPT, MBR by default); see the documentation on [[ventoy.net>>https://ventoy.net]] and in the program's README, for installation details.
146 146  {{/info}}
147 147  
148 -(% class="wikigeneratedid" %)
149 149  
150 150  
151 151  == Key takeaway ==

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