sgdisk: add page

pages/common/sgdisk.md

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+# sgdisk
+
+> Manage GUID Partition Tables (GPT).
+> Part of the GPT fdisk suite; designed for scripting and automation.
+> More information: <https://manned.org/sgdisk>.
+
+- Display basic GPT partition summary data for a device:
+
+`sudo sgdisk {{[-p|--print]}} {{/dev/sdX}}`
+
+- Wipe both GPT and MBR data structures from a device (destroys all partition information):
+
+`sudo sgdisk {{[-Z|--zap-all]}} {{/dev/sdX}}`
+
+- Convert a GPT disk to MBR format using up to four partitions:
+
+`sudo sgdisk {{[-m|--gpttombr]}} {{1:2:3:4}} {{/dev/sdX}}`
+
+- Delete a partition entry by number (data in sectors remains untouched):
+
+`sudo sgdisk {{[-d|--delete]}} {{1}} {{/dev/sdX}}`
+
+- Save the current in-memory GPT data (protective MBR, headers, and table) to a binary backup file:
+
+`sudo sgdisk {{[-b|--backup]}} {{/path/to/backup.gpt}} {{/dev/sdX}}`
+
+- Load GPT data from a backup file (restoring from a non-original disk is not recommended):
+
+`sudo sgdisk {{[-l|--load-backup]}} {{/path/to/backup.gpt}} {{/dev/sdX}}`
+
+- Verify GPT structures for CRC errors, mismatches, or inconsistencies:
+
+`sudo sgdisk {{[-v|--verify]}} {{/dev/sdX}}`
+
+- Display a summary of available partition type codes (no device required):
+
+`sgdisk {{[-L|--list-types]}}`