OSFClone

OSFClone is a free, bootable utility for creating or cloning disk images outside the installed operating system. It suits evidence-preservation and integrity-conscious imaging workflows; its format and verification options are useful, but critical work calls for a write blocker and careful handling.

Overview

OSFClone captures exact raw disk images, including unused sectors, slack space, file fragmentation and undeleted file records. That makes it a better fit for preserving a drive’s contents than a file-copying approach. It can also image to AFF, EWF and dc3dd formats, though it is a focused imaging utility rather than a general-purpose disk-management suite.

The maker describes cloning FAT, NTFS and USB-connected drives. Images can be mounted with PassMark OSFMount and analyzed with PassMark OSForensics, giving the imaging step a place in a broader forensic workflow.

Key features

• Hash comparison: OSFClone compares MD5 or SHA1 hashes of a clone and its source drive. This gives integrity-conscious users a way to check that the clone matches its source.
• Compression and case metadata: It can compress images and save a case number, evidence number, examiner name, description and checksum. Those fields help keep image files associated with their case records.
• Bootable media: It boots from CD/DVD or USB flash drives. The current download is a 373 MB ZIP for version 1.4.1000, and USB installation requires a drive of at least 2 GB.
• Integrity precautions: Hardware, driver and disk-state differences create a small chance of evidence contamination, according to the maker. For work where integrity is critical, it recommends a write blocker. Imaging an ext2/3/4 drive while it is connected during startup may also alter filesystem superblock values; the maker recommends a write blocker or connecting the drive after boot.
• Boot compatibility: OSFClone may not boot on some UEFI systems. Switching the system boot mode to CSM is the maker’s suggested workaround, but that limitation makes it less straightforward on affected machines.
• License: The software is licensed under GPL v3.0.

Pricing

OSFClone is free: the OSFClone plan costs nothing and provides a self-booting disk-imaging utility, with current version v1.4.1000. There is no paid tier to weigh against the free edition. The main practical requirements are a USB drive of at least 2 GB for USB installation and appropriate precautions for sensitive evidence imaging.

Platforms

OSFClone is described for Linux and Windows workflows, with supported platforms including Windows 10 and Windows 11; older versions are available for some earlier Windows releases. It boots from optical media or USB, but may fail to start on some UEFI systems unless the boot mode is switched to CSM.

Who it's for

Choose OSFClone if you need a free, bootable way to make sector-preserving disk images, compare source and clone hashes, and attach basic forensic case metadata. It is less suitable when you need a boot process that works consistently across UEFI systems or when you cannot manage the contamination and ext2/3/4 precautions the maker describes.

Pros and cons

• Pro: It preserves slack space, unused sectors, fragmentation and undeleted file records, which matters when an image must retain more than visible files.
• Pro: MD5 or SHA1 comparison, compression and case metadata support a more traceable imaging workflow without a paid plan.
• Con: The maker warns that hardware, driver and disk-state variations can risk contamination, so integrity-critical work needs a write blocker.
• Con: ext2/3/4 drives may have superblock values altered if connected during startup, and some UEFI systems may not boot OSFClone.

Alternatives

For mounting disk images rather than creating them, Arsenal Image Mounter offers a free mode with temporary write support, BitLocker tools, and CLI and PowerShell access; its 1 Year Plan costs $907 a year. ExpanDrive is a better fit for personal access to cloud services and protocols: its free plan is billed forever and covers up to 10 users or devices per year, rather than bootable disk imaging.

libguestfs is a free open-source library and tools option for users who want that toolset instead of OSFClone’s bootable imaging utility. RaiDrive is another alternative. Alcohol 52% offers a Windows-focused alternative. CDEmu is a free Linux optical drive and disc emulator, while DAEMON Tools Lite and gBurner Virtual Drive are alternatives for virtual-drive use.

Browse Disk Cloning Software for more cloning options or Virtual Drive Software for image-mounting tools.

Verdict

OSFClone is a sound choice for users who need free, bootable disk imaging with hash comparison and case metadata, particularly when preserving sectors beyond ordinary files matters. Look elsewhere if your workflow depends on reliable UEFI booting or if you cannot use a write blocker and manage the stated filesystem risks.