Changes for page Effacer la signature d'un périphérique avec wipefs
Last modified by Mélodie on 2026/07/11 13:38
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... ... @@ -61,6 +61,7 @@ 61 61 {{/code}} 62 62 {{/info}} 63 63 64 +(% class="wikigeneratedid" %) 64 64 65 65 66 66 === 3. Check the partition table type and the presence of signatures === ... ... @@ -107,6 +107,7 @@ 107 107 ##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. 108 108 {{/info}} 109 109 111 +(% class="wikigeneratedid" %) 110 110 111 111 112 112 === 6. Force the kernel to reread the partition table === ... ... @@ -122,7 +122,7 @@ 122 122 Without this step, the system may still display a cached state during the next verification, rather than the device's actual state after cleanup. 123 123 124 124 125 -=== 7. Check effectiveness of the cleanup ===127 +=== 7. Verify that the cleanup was effective === 126 126 127 127 With administrator privileges: 128 128 ... ... @@ -130,23 +130,9 @@ 130 130 blkid -p /dev/sdX 131 131 {{/code}} 132 132 133 -Shouldn't return anything (or only the device's generic information) ,whichmeansthe devicehasbeenproperlycleaned.(##/dev/sdX## should still be adapted.)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). 134 134 135 -Additionally, it's possible to inspect the raw bytes of the first sector directly: 136 136 137 -{{code language="bash"}} 138 -hexdump -C -n 512 /dev/sdX | tail -n 2 139 -{{/code}} 140 - 141 -or, equivalently: 142 - 143 -{{code language="bash"}} 144 -xxd -l 512 /dev/sdX | tail -n 2 145 -{{/code}} 146 - 147 -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. 148 - 149 - 150 150 === 8. Repartition === 151 151 152 152 ... ... @@ -157,6 +157,7 @@ 157 157 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. 158 158 {{/info}} 159 159 148 +(% class="wikigeneratedid" %) 160 160 161 161 162 162 == Key takeaway ==