chunkdisk v1.6

Changes

• Check 64-bit and 128-bit file ID of part directories for compatibility.

chunkdisk v1.5

Changes

• Add option (-U GUID) to set the serial number of the virtual disk.
• Print errors in detail while starting.
• Remember only a limited number of chunk locations for memory usage.
• Add option (-M 1) to support for moving chunks. Chunks must be locked properly to be moved.
• Fix out of memory by Unmap() with large ranges.
• Add option (-X 0) to disable truncating completely unmapped chunk.

chunkdisk v1.4

Changes

• Fix tracking recently unmapped pages.
• Fix an I/O error when writing to a new differential chunk, which may cause loss of data.
• Fix locking chunks.

The issues fixed in this release affect releases from v0.9 to v1.3.

chunkdisk v1.3

Changes

• Add option (-Z 0) to disable zero-fill partially unmapped chunk.

chunkdisk v1.2

Changes

• New feature: differential disk.
• The .lock file is not removed automatically on exit if -W 0 option is given. Manually remove it to mount again with -W 1 option.
• Close file handles to trigger updating metadata when the virtual disk is not only idle but under low load for a minute.
• Handle the case where the file system does not support FSCTL_SET_ZERO_DATA IOCTL.

chunkdisk v1.0

Changes

• Change maximum transfer length to 1MB to maximize sequential performance.
• Revert deterministic I/O scheduling to handle concurrent I/O's as intended.
• Improve handling buffers for small-sized I/O's.
• Fix bugs in unaligned (page-based) I/O's.
• Fix inactivity timer.

Notes

• winspd-x64.dll is same as in v0.9.
• PDB files are included for debugging purposes.

chunkdisk v0.9

• Fix chunks created and written when unmapped partially.
• Use unbuffered, asynchronous I/O.
• Make I/O scheduling deterministic for better sequential performance on HDDs.
• Merge unmap ranges across requests for better space efficiency.
• Flush file metadata after one minute of inactivity.

chunkdisk v0.6

• Create .lock file to prevent re-mounting.
• Add chunkdisk-t class in install.reg to set the number of I/O threads by launchctl-x64.exe start chunkdisk-t InstanceName File.chunkdisk Number.

chunkdisk v0.5

• Use buffered I/O to improve performance. But the drive stutters when Windows flushes written buffer to the backing chunk.

chunkdisk v0.4

• Use unbuffered I/O instead of memory mappings.
• Chunk size must be a multiple of 4096. This breaks backward compatibility.
• Add an option -t to adjust number of I/O threads.
• Performance tunings.