I have a Chromebook, with fdisk -l of the internal flash being: Disk /dev/mmcblk0: 29.12 GiB, 31268536320 bytes, 61071360 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: 8648551F-D8FC-AC44-AA00-C0CA32C4A9BC Device Start End Sectors Size Type /dev/mmcblk0p1 8704000 61063119 52359120 25G Microsoft basic data /dev/mmcblk0p2 20480 53247 32768 16M ChromeOS kernel /dev/mmcblk0p3 4509696 8703999 4194304 2G ChromeOS root fs /dev/mmcblk0p4 53248 86015 32768 16M ChromeOS kernel /dev/mmcblk0p5 315392 4509695 4194304 2G ChromeOS root fs /dev/mmcblk0p6 16448 16448 1 512B ChromeOS kernel /dev/mmcblk0p7 16449 16449 1 512B ChromeOS root fs /dev/mmcblk0p8 86016 118783 32768 16M Microsoft basic data /dev/mmcblk0p9 16450 16450 1 512B ChromeOS reserved /dev/mmcblk0p10 16451 16451 1 512B ChromeOS reserved /dev/mmcblk0p11 64 16447 16384 8M unknown /dev/mmcblk0p12 249856 315391 65536 32M EFI System Partition table entries are not in disk order. and -lx being: Disk /dev/mmcblk0: 29.12 GiB, 31268536320 bytes, 61071360 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: 8648551F-D8FC-AC44-AA00-C0CA32C4A9BC First usable LBA: 34 Last usable LBA: 61063134 Alternative LBA: 61063167 Partition entries starting LBA: 2 Allocated partition entries: 128 Partition entries ending LBA: 33 Device Start End Sectors Type-UUID UUID Name Attrs /dev/mmcblk0p1 8704000 61063119 52359120 EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 D8331AD0-ED78-F442-87F4-78DF0130895A STATE /dev/mmcblk0p2 20480 53247 32768 FE3A2A5D-4F32-41A7-B725-ACCC3285A309 CCFE5BD8-BBE4-A840-9C0B-BBA6427B6309 KERN-A GUID:49,56 /dev/mmcblk0p3 4509696 8703999 4194304 3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC E71F6E02-1BC3-9D43-9EDD-2C7CA20D512A ROOT-A /dev/mmcblk0p4 53248 86015 32768 FE3A2A5D-4F32-41A7-B725-ACCC3285A309 753B5AEB-254E-AE47-8B69-FF58D9AC7DEA KERN-B GUID:48,56 /dev/mmcblk0p5 315392 4509695 4194304 3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC 8D0AAB90-FCDD-1B4E-88C1-25591367535A ROOT-B /dev/mmcblk0p6 16448 16448 1 FE3A2A5D-4F32-41A7-B725-ACCC3285A309 A1F17DE0-C736-0749-9D46-C7AF964C0805 KERN-C GUID:52,53,54,55 /dev/mmcblk0p7 16449 16449 1 3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC 9D3217B1-C796-694B-8F13-5266A7B03F3E ROOT-C /dev/mmcblk0p8 86016 118783 32768 EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 37A18CE9-ACF2-894B-9B67-C212C374C100 OEM /dev/mmcblk0p9 16450 16450 1 2E0A753D-9E48-43B0-8337-B15192CB1B5E F534539C-EDAC-2C44-A6CD-827D7490CF50 reserved /dev/mmcblk0p10 16451 16451 1 2E0A753D-9E48-43B0-8337-B15192CB1B5E E4248D3E-6EA0-B148-8215-B50269CE9678 reserved /dev/mmcblk0p11 64 16447 16384 CAB6E88E-ABF3-4102-A07A-D4BB9BE3C1D3 530A6C46-BDFA-7C40-A446-FC05001BDA82 RWFW /dev/mmcblk0p12 249856 315391 65536 C12A7328-F81F-11D2-BA4B-00A0C93EC93B BCF61070-764A-004F-8ABD-590A44996A91 EFI-SYSTEM LegacyBIOSBootable Partition table entries are not in disk order. Note part 11/RWFW being "unknown". The fdisk on the device doesn't know it, and upstream doesn't either. The only google result is https://chromium.googlesource.com/chromiumos/docs/+/d5eefaba799595d6cd302de047325ca8295dd87e/disk_format.md which agrees with the other three ChromeOS definitions fdisk knows, so add this one as well, and link to the live document. fdisk -l now shows: /dev/mmcblk0p10 16451 16451 1 512B ChromeOS reserved /dev/mmcblk0p11 64 16447 16384 8M ChromeOS firmware /dev/mmcblk0p12 249856 315391 65536 32M EFI System --- diff '--color=auto' -u -r util-linux-2.39.3.orig/include/pt-gpt-partnames.h util-linux-2.39.3/include/pt-gpt-partnames.h --- util-linux-2.39.3.orig/include/pt-gpt-partnames.h 2023-11-30 11:26:09.675522060 +0100 +++ util-linux-2.39.3/include/pt-gpt-partnames.h 2024-01-18 19:00:19.208308527 +0100 @@ -229,8 +229,10 @@ DEF_GUID("49F48DAA-B10E-11DC-B99B-0019D1879648", N_("NetBSD RAID")), /* ChromeOS */ +/* https://chromium.googlesource.com/chromiumos/docs/+/main/disk_format.md#partition-types */ DEF_GUID("FE3A2A5D-4F32-41A7-B725-ACCC3285A309", N_("ChromeOS kernel")), DEF_GUID("3CB8E202-3B7E-47DD-8A3C-7FF2A13CFCEC", N_("ChromeOS root fs")), +DEF_GUID("CAB6E88E-ABF3-4102-A07A-D4BB9BE3C1D3", N_("ChromeOS firmware")), DEF_GUID("2E0A753D-9E48-43B0-8337-B15192CB1B5E", N_("ChromeOS reserved")), /* MidnightBSD */
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