changes.md

20260614

Components in this release:

• fat95 3.24 (07.06.2026)
• install95 3.19 (25.01.2026)
• dd 2.2 (13.06.2026) (new)
• debug95 3.19 (25.01.2026)
• SetFileSize 1.1 (25.01.2026)
• boot95 3.19 (25.01.2026)
• lsfsres 1.0 (16.05.2026)

Tools

This release is mainly a dd maintenance update. dd 2.2 adds TD64 support for large-disk transfers, fixes unreliable NSD detection from the previous dd release, and improves INSPECT output.

dd 2.2

IO (transfer) command usage changes:

• Added TD64 support through TD_READ64 and TD_WRITE64
• Runtime fallback from NSCMD_TD64 to TD64 to HD_SCSICMD.
• Hardened the NSD probe, fixing issue #20.
• INSPECT now reports all detected >4 GiB I/O transfer methods.
• INSPECT VERBOSE now lists all supported commands.
• Added a new CMD=AUTO|CMD|TD64|NSCMD|SCSI argument to force the transfer command.

dd 2.1

• On Kickstart older than 2.0 (V36), dd now prints a short message saying it needs Kickstart 2.0+ and exits, instead of failing silently.
• Console output now uses VFPrintf.

20260609

Components in this release:

• fat95 3.24 (07.06.2026) (new)
• install95 3.19 (25.01.2026)
• dd 2.0 (01.06.2026) (new)
• debug95 3.19 (25.01.2026)
• SetFileSize 1.1 (25.01.2026)
• boot95 3.19 (25.01.2026)
• lsfsres 1.0 (16.05.2026)

fat95 handler

• fat95 3.24 Adds a second way to choose which FAT partition a mountlist mounts via Device name suffix. Set DosType to 0x464154FF for every FAT mount, and the number at the end of the device name picks the partition. The number is 0-based, like DF0: and HD0:: CF0: is the first FAT partition, CF1: the second, and so on. The old way DosType byte (FAT\<n>) is unchanged, and you can mix them on one system. See Partition Selection for full details.

Tools

dd 2.0

Major update with breaking change in argument positioning and parsing.

• CLI parsing (breaking change). dd now uses the standard AmigaOS argument parser, so bad arguments are caught up front instead of silently mis-parsed. Type dd ? for the new usage banner. The unit number moved from between SRC and DST to a single positional slot after DST; for device-to-device copies use the keyword form US <n> / UD <n>. FILL:, RSPEED:, RWSPEED: are unchanged. See dd Usage for more details.
• NSD 64-bit I/O support. dd now probes NSD at device open and uses NSCMD_TD_READ64/NSCMD_TD_WRITE64 when the driver advertises them. This is an additional dispatch path next to the existing HD_SCSICMD (SCSI READ10/WRITE10) fallback that already handles >4 GiB I/O on drivers without NSD.
• INSPECT mode. dd INSPECT <device.name> [UNIT n] prints device geometry, NSD support (if any), and which command set dd would use for I/O on the device.

Packaging

• Archive version is now a date (YYYYMMDD). The release bundle ships several independently-versioned pieces (fat95, install95, dd, debug95, SetFileSize, boot95, lsfsres), each on its own cadence, so a single v3.x number for the whole archive never matched what was actually inside.

3.23 (19.05.2026)

This release brings several reliability fixes, contributed by Stefan Reinauer (@reinauer). Thanks!

• Bug fixes

  • File position is now correctly advanced after a short (partial) write, preventing data corruption on subsequent writes to the same file handle.
  • SCSI READ10/WRITE10 commands now correctly clamp the block count to 16 bits; previously, large I/O requests could silently transfer fewer blocks than requested.
  • I/O retries are now aborted if the disk was swapped during a retried read or write, preventing silent data corruption when media changes mid-operation.
  • The .. (parent) directory entry for subdirectories created under the FAT32 root now correctly stores cluster 0, fixing fsck.vfat complaints on FAT32 volumes.
  • The free-cluster scan in ExtendChain is now bounded to avoid an infinite loop on a corrupted or full FAT.

• Performance

  • FAT16 free-cluster counting during mount is now ~50% faster on 68000, by scanning the raw FAT buffer directly instead of calling the generic GetFATEntry path per entry.

3.22 (16.05.2026)

This release improves ROM resident handling:

• ROM resident installation now registers FAT\0 through FAT\8 in FileSystem.resource at boot, so any partition with one of those DosTypes, whether RDB auto-mounted or mounted later via a mountlist / mount command, uses the ROM handler directly and skips loading L:fat95 from disk. Previously the ROM resident registration did not actually run at boot, so even with fat95 baked into a Kickstart ROM every FAT mount fell back to loading L:fat95 from disk.
• New c/lsfsres tool lists every entry in FileSystem.resource with DosType, version, SegList address, handler name, and a [ROM]/[RAM] tag. Useful for confirming which filesystem handlers are active and whether they come from ROM or disk.

This release also contains internal micro-optimisations and minor size reductions:

• Several inner loops are optimised for both CPU tiers.
• Directory block clearing and file delete are faster on 68000.
• FAT entry reads on 68020+ use fewer instructions.
• SCSI READ10/WRITE10 command setup now uses a shared helper.
• GPT partition GUID matching is now table-driven.

3.21 (18.04.2026)

This release focuses on stability and compatibility improvements across both CPU tiers (68000/68010 and 68020+).

• Improvements

  • Fixed an unaligned long-word compare in the NTFS boot-sector check that could raise an Address Error on 68000/010.
  • GPT partition detection (3.19+) now follows the AmigaOS register-preservation rules; a violation could have corrupted caller state after a mount.
  • Partition state is reset before every mount attempt, so a failed or rejected probe can no longer influence the next one.
  • GPT FAT allowed partition type GUIDs are now both Microsoft Basic Data (EBD0A0A2-B9E5-4433-87C0-68B6B72699C7) and EFI System Partition (C12A7328-F81F-11D2-BA4B-00A0C93EC93B).

• CPU-tier builds

  • fat95 now ships in two CPU tiers. Copy the one matching your CPU to L:fat95:
    • l/68020/fat95 -- A1200 stock + 68020+ accelerators (030/040/060)
    • l/68000/fat95 -- stock A500 / A600 / A1000 / A2000 / CDTV
  • 68020+ build is slightly smaller thanks to native 32-bit math. See CPU tiers.
  • The $VER: string is tagged [68020] or [68000], so version l:fat95 full shows which tier is loaded.

3.20 (16.03.2026)

• NTFS volume rejection
  • NTFS volumes are now explicitly rejected and reported as unrecognised instead of being incorrectly mounted as an unnamed FAT volume with its serial number as the volume name (e.g. "0000-0100").
  • Affects GPT disks (both FAT and NTFS share the same "Microsoft Basic Data" partition GUID), MBR disks where an NTFS partition was placed in a FAT partition slot (e.g. type 0x0B/0x0C), and unpartitioned direct volume access paths.
  • Relates to github issues: pulchart/cfd#37, salass00/ntfs-3g#3

3.19 (01.02.2026)

• Fork of 3.18

  • Set English as default localization for fat95 handler.
  • Rebuild by vasm 2.0d.
  • Consolidated documentation into fat95.guide.

• Detect SFS/PFS/FFS/RDB as foreign disk formats.

• GPT partition table support

  • Automatic detection of GPT disks via protective MBR (type 0xEE).
  • Scans GPT partition entries whose type GUID is Microsoft Basic Data or EFI System Partition (FAT candidates).
  • Supports partition selection via DosType (same as MBR: FAT\1, FAT\2, etc.).

• Improved disk change handling

  • Non-existent partitions now show "No Disk" instead of "Uninitialized".
  • Fixes stale partition data when switching to cards with fewer partitions. See Disk Status Meanings.
  • Foreign disk formats (RDB, PFS, SFS) show appropriate status per partition.

• Bug fixes

  • Fixed trailing slashes in path names (e.g., makedir cf0:temp/ now correctly creates temp).
  • WARNING: Using trailing slashes with 3.18 corrupted the filesystem.

Original fat95 History Through v3.18

Version	Date	Changes
v3.18	03/2013	Open source release LGPL (Torsten Jager)
v3.17	-	No info
v3.16	-	No info
v3.15	05/2004	Added "l" option (lowercase 8.3 names)
v3.14	05/2004	Added "L" option (uppercase initial)
v3.13	02/2004	PalmOS formatted memory card support
v3.12	11/2003	Alternative disk recognition via SCSI, optional TD_UPDATE, faster small writes
v3.11	08/2003	Optimized short name generator, directory updates during writes
v3.10	07/2003	Fixed directory creation bugs, international character fixes
v3.09	04/2003	Security erase feature, abortable scandisk
v3.08	10/2002	Skipped version number
v3.07	09/2002	File writing fix, SCSI auto-select, Hungarian localization
v3.06	08/2002	Faster small file access
v3.05	07/2002	New configuration options
v3.04	07/2002	Removed startup messages, scandisk fixes, improved dd tool
v3.03	05/2002	Removed DiskUpdate error message
v3.02	03/2002	Directory creation fix, FAT12 CF card formatting, SCSI error checking
v3.01	02/2002	Minor short name bug fix
v3.00	02/2002	User character set for 8.3 names, official FAT32 cluster sizes
v2.19	01/2002	Filenames up to 104 characters
v2.18	12/2001	SetFileSize() support, user language support
v2.17	09/2001	Faster FAT32, Amiga reformatted ZIPs recognized
v2.16	08/2001	MaxTransfer fix, FileSystem.resource code sharing
v2.15	05/2001	Crash fixes, pure attribute, error check, boot95 tool
v2.14	03/2001	FAT32 mode bug fix
v2.13	02/2001	New buffering system
v2.12	02/2001	SCSI direct command support
v2.11	12/2000	Better FDA compatibility
v2.10	10/2000	Exotic partition tables, TD64 error requester
v2.9	09/2000	AddBuffers fix, safer CURRENT_VOLUME, trackwise access
v2.8	08/2000	Software write protection, fat95debug tool
v2.7	08/2000	Logical drive recognition fix
v2.6	07/2000	Disk full crash fix, inconsistent file access fix
v2.5	07/2000	Track-wise buffering, FAT32 free space fix
v2.4	07/2000	Exclusive locks fix, 8.3 name fixes
v2.3	07/2000	Native ExAll(), ChangeMode(), various bugfixes
v2.2	06/2000	Restart validator, 65-char filenames, FAT32 formatting
v2.1	04/2000	NSD and TD64 support, FAT32 28-bit fix, timestamp fix
v2.0	04/2000	First FAT32 support
v1.22	03/2000	Large sectors fix (>512 bytes)
v1.21	03/2000	Cluster-wise file access, diskchange messages
v1.20	03/2000	Separate caches, workbench icon suppression
v1.19	03/2000	Partition selection fix
v1.18	03/2000	First partition support
v1.17	02/2000	Second published version, improved FORMAT
v1.16	-	No info
v1.15	02/2000	Code optimizations
v1.14	02/2000	FAT copy update fix
v1.13	02/2000	SERIALIZE_DISK fix
v1.12	01/2000	ETD commands, SERIALIZE_DISK, faster FAT16 writeback
v1.11	01/2000	Device workarounds, faster drawer operations
v1.10	-	No info
v1.9	-	No info
v1.8	01/2000	Workaround for register-trashing devices
v1.7	01/2000	Formatting fix, double-mount crash fix, reentrant code
v1.6	12/1999	Large partition fix, SID2 workaround, serial number, dir optimization
v1.5	11/1999	First published version