Difference between revisions of "Translations:Some basics of MBR v/s GPT and BIOS v/s UEFI/30/fr"

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Message definition (Some basics of MBR v/s GPT and BIOS v/s UEFI)

Conversions from MBR to GPT works because of inefficiencies in the MBR partitioning scheme. On an MBR disk, the bulk of the first cylinder of the disk goes unused—only the first sector (which holds the MBR itself) is used. Depending on the disk's CHS geometry, this first cylinder is likely to be sufficient space to store the GPT header and partition table. Likewise, space is likely to go unused at the end of the disk because the cylinder (as seen by the BIOS and whatever tool originally partitioned the disk) will be incomplete, so the last few sectors will go unused. This leaves space for the backup GPT header and partition table. (Disks partitioned with 1 MiB alignment sometimes leave no gaps at the end of the disk, which can prevent conversion to GPT format—at least, unless you delete or resize the final partition.)

Conversions from MBR to GPT works because of inefficiencies in the MBR partitioning scheme. On an MBR disk, the bulk of the first cylinder of the disk goes unused—only the first sector (which holds the MBR itself) is used. Depending on the disk's CHS geometry, this first cylinder is likely to be sufficient space to store the GPT header and partition table. Likewise, space is likely to go unused at the end of the disk because the cylinder (as seen by the BIOS and whatever tool originally partitioned the disk) will be incomplete, so the last few sectors will go unused. This leaves space for the backup GPT header and partition table. (Disks partitioned with 1 MiB alignment sometimes leave no gaps at the end of the disk, which can prevent conversion to GPT format—at least, unless you delete or resize the final partition.)

Les conversions de MBR à GPT fonctionnent en raison des inefficacités du schéma de partitionnement MBR. Sur un disque MBR, la majeure partie du premier cylindre du disque est inutilisée, seul le premier secteur (qui contient le MBR lui-même) est utilisé. Selon la géométrie CHS du disque, ce premier cylindre est susceptible d'être suffisant pour stocker l'en-tête GPT et la table de partition. De même, il est probable que de l'espace soit inutilisé à la fin du disque car le cylindre (tel qu'il est vu par le BIOS et l'outil qui a partitionné le disque à l'origine) sera incomplet, de sorte que les derniers secteurs seront inutilisés. Cela laisse de l'espace pour l'en-tête GPT de sauvegarde et la table de partition. (Les disques partitionnés avec un alignement de 1 MiB ne laissent parfois aucun espace à la fin du disque, ce qui peut empêcher la conversion au format GPT - du moins, à moins que vous ne supprimiez ou redimensionniez la partition finale).