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(Documentation for the EXPERT Mode=APFS menu)
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(Mode=APFS)


Mode=APFS Menu: [APFS container File System]

Select container Volume

From main menu: Mode=APFS -> Select container Volume

Select one of the Volumes present in the APFS container, by number or name

Menu item screenshot(s)


   This submenu lists all the identified Volume names in
   the filesystem, so you can select one for further use.

   An APFS filesystem can have more than one volume, that all share
   the same pool of available freespace in the whole partition.

   Selecting a Volume will make that the ACTIVE volume, for which you
   can display the volume relevant information, and browse its contens

   On opening an APFS partition the FIRST volume (0) will be ACTIVE

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



Refresh to last checkpoint

From main menu: Mode=APFS -> Refresh to last checkpoint

Refresh by finding the latest checkpoint and superblock (highest Xid value)

Menu item screenshot(s)


   This refreshes the FS-view to the most recent CHECKPOINT

   This will re-read the master-superblock, then iterate over all the
   checkpoints present (usually hundreds) and select the Checkpoint-Map
   and associated superblock with the highest transaction-ID (Xid value)

   A checkpoint is a set of filesystem structures, representing a
   consistent view on the filesystem at one specific point in time.

   When the filesystem is still MOUNTED by the operating system, there
   may have been new transactions (changes) that are NOT reflected in
   the latest checkpoint yet. In that case the container is UNSTABLE
   and not all operations may work reliably.

   Refreshing just before performing an operation may help in that case

   When the filesystem is UNMOUNTED, and STABLE, there is no need
   to refresh, since there will be no new checkpoints created ...

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



Display Superblock

From main menu: Mode=APFS -> Display Superblock

Display the SUPERBLOCK structure for the currently selected filesystem


    This will display the contents of the filesystem superblock
    in a textual format matching the current filesystem type.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   


Display SpaceManager info

From main menu: Mode=APFS -> Display SpaceManager info

Display the current Spacemanager object, with container allocation/freespace


   This will navigate to the SPACEMANAGER object block for the CURRENT
   container superblock, to show a block-allocation information summary
   followed by the first bitmap-index object (CAB or CIB).

   From there, an <ENTER> or 'd' command will display the start of the
   first bitmap block for that index.

   Note that bitmaps in APFS are SPARSE, meaning that for ranges without
   any block allocated, the corresponding bitmap block is NOT there yet,
   indicated by a ZERO value for its block number in the index table.

   The SpaceManager objects are located using the command 'super#u#d#d'
   without echoing these, or displaying the intermediate objects

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



Describe (sub) Type Records

From main menu: Mode=APFS -> Describe (sub) Type Records

Show APFS block types/subtypes with select char, and the Btree RECORD types

Menu item screenshot(s)


   This shows an overview of the APFS object (block) types and subtypes
   and for the main types also shows the selection character to be used
   to FIND or select such a block

   Type and subtypes are displayed as part of the HEADER for every APFS
   object, and they can be used as an exclusion mechanism with the 'DUMP'
   command -x, -y and -z options.

   The selection character can be used with the generic 'FIND' command
   and as an inclusion mechanism with the 'DUMP' command.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   


Dump most important Blocks

From main menu: Mode=APFS -> Dump most important Blocks

Search and dump the most important APFS blocks for the CURRENT checkpoint


   This will search for valid APFS objects (blocks with valid checksum)
   and dump the most important ones that match the latest (and CURRENT)
   container-superblock with its transacion-ID (Xid)

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   


Display ALL FS-tree records

From main menu: Mode=APFS -> Display ALL FS-tree records

Display ALL RECORDS from the FS-tree using a single line per record (leaves)


   This will iterate over all (cached) APFS LEAF-Node blocks which are
   part of the APFS FS-tree catalogfile and display each contained record
   in a SINGLE line each, formatted according to the record type.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   


Display selected INO-records

From main menu: Mode=APFS -> Display selected INO-records

Display INO-RECORDS from the FS-tree matching specified wildcard (leaves)

Menu item screenshot(s)


   This will iterate over all (cached) APFS LEAF-Node blocks which are
   part of the APFS FS-tree catalogfile and display only those INODE
   RECORDS where the NAME matches the given selection wildcard.

   The INODE display is TWO lines, showing things like filename,
   size in bytes, attributes, user/group info, timestamps and so on.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   


Display selected DIR-records

From main menu: Mode=APFS -> Display selected DIR-records

Display DIR-RECORDS from the FS-tree matching specified wildcard (leaves)


   This will iterate over all (cached) APFS LEAF-Node blocks which are
   part of the APFS FS-tree catalogfile and display only those DIR
   RECORDS where the NAME matches the given selection wildcard.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



Delete THIS partition

From main menu: Mode=APFS -> Delete THIS partition

Delete the currently selected partition from the partition tables


    This will delete the partition that is currently selected to be
    deleted from the partition-tables. This will result in the space
    occupied by the partition becoming FREESPACE that can be used
    again to create new partitions.

    For primary partitions on LVM-systems, the related LVM-information
    is cleared as well, to avoid consistency problems later when a new
    partition is created at the same position.

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



Reselect whole disk, FDISK

From main menu: Mode=APFS -> Reselect whole disk, FDISK

Unselect filesystem, reselect the same/first disk; enables Mode=FDISK menu

Menu item screenshot(s)


    This will UNSELECT the current object/filesystem, and reselect a
    whole physical disk, either the same disk as the partition was on,
    or the first disk present in other cases.

    This is a quick way to change to 'Mode=FDISK' and work on
    disk-level issues

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    Press <F1> again for more help; Some options may require switching to 'Expert mode'

   



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(to DFSee main pages)  |  File  |  Edit  |  Actions  |  Image  |  View  |  Scripts  |  Set  |  Help  |  (to BASIC menu)
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