Cfadisk Inf May 2026

| Issue | Detail | |-------|--------| | Not TRIM-aware | CF cards have no garbage collection. Performance degrades over time. Use industrial CF cards (e.g., Transcend, Swissbit) with built-in wear leveling. | | No Driver Signing (x64) | For Win 8/10/11 64-bit, you must permanently enable Test Mode (bcdedit /set testsigning on) or use an older, self-signed version. | | Windows 10/11 Updates | Major updates (e.g., 22H2) may overwrite the driver. You must reapply it. | | Not for SD cards | This driver is specifically for CF (CompactFlash). For SD cards, use a different solution (e.g., dummydisk.sys). | | SATA Hotplug | May cause blue screens if you remove the card without safely ejecting (because Windows now thinks it's a fixed HDD). |

The cfadisk.inf driver is a small file with a massive impact. It bridges the gap between portable flash media and internal fixed disks, allowing enthusiasts and professionals to repurpose cheap, rugged CompactFlash cards for bootable systems, embedded applications, and legacy IDE machines.

By following this guide—identifying your CF card’s hardware ID, modifying the INF correctly, and navigating Windows driver signing—you can transform a humble CF card into a fully recognized fixed disk. Just remember the trade-off: convenience for caution. Once installed, your CF card will behave like a hard drive in every way, except the one that matters most: it can still be yanked out without warning.

Final Pro Tip: After installation, use fsutil to check your disk type. Open Command Prompt as admin and type: fsutil fsinfo drivetype X: (replace X with your CF drive letter). If it returns Fixed Drive, congratulations—you have mastered the cfadisk.inf configuration.

Disclaimer: This article is for educational purposes. Modifying system drivers may void warranties or cause data loss. Always work on a test system and maintain backups. Cfadisk Inf

cfadisk.inf is part of the Hitachi Microdrive Filter driver , a classic tool used by power users to trick Windows into recognizing a removable USB flash drive or SD card as a fixed (local) hard disk This modification is typically used to: Create multiple partitions

on a USB stick (older versions of Windows only see the first partition on "removable" devices). Install software or Windows components that require a local disk to run. kak.kornev-online.net How to use cfadisk.inf

To make the driver work with your specific USB device, you must manually edit the file to include your device's unique Hardware ID Guide to Mount SD Card as HardDisk - Windows Central Forum

The cfadisk.inf file is the setup information file for the Hitachi Microdrive Filter Driver. It is most commonly used to trick Windows into recognizing a removable USB flash drive or SD card as a fixed local hard disk.  | Issue | Detail | |-------|--------| | Not

This modification is often necessary to create multiple partitions on a USB drive (in older Windows versions) or to install software that requires a "fixed" disk.  Typical cfadisk.inf File Structure 

To "put together" this file, you generally start with a standard template and modify the [cfadisk_device] section with your specific device ID. 

[Version] Signature="$Windows NT$" Class=DiskDrive ClassGuid=4d36e967-e325-11ce-bfc1-08002be10318 Provider=%HGST% DriverVer=12/14/2002,1.0.0.1 [Manufacturer] %HGST%=cfadisk_device [cfadisk_device] ; This is the line you must edit with your device's ID %Microdrive_devdesc% = cfadisk_install,USBSTOR\Disk&Ven_LEXAR&Prod_JD_LIGHTNING&Rev_1100 [cfadisk_install] CopyFiles=cfadisk_copyfiles [cfadisk_copyfiles] cfadisk.sys,,,2 [cfadisk_install.Services] AddService=cfadisk,2,cfadisk_ServiceInstallSection [cfadisk_ServiceInstallSection] DisplayName="Hitachi Microdrive Filter Driver" ServiceType=1 StartType=3 ErrorControl=1 ServiceBinary=%12%\cfadisk.sys LoadOrderGroup=PnP Filter [Strings] HGST="Hitachi Global Storage Technologies" Microdrive_devdesc="Hitachi Microdrive" Use code with caution. Copied to clipboard How to Customise Your File 

Find your Device Instance Path: Open Device Manager, right-click your USB drive, go to Properties > Details tab, and select Device Instance Path from the dropdown. Disclaimer: This article is for educational purposes

Copy the ID: Copy the string (e.g., USBSTOR\Disk&Ven_SanDisk&Prod_Cruzer&Rev_1.00\1234567890).

Edit the .inf: Open your cfadisk.inf in a text editor like Notepad. Locate the [cfadisk_device] section and replace the existing device string with your copied ID.

Note: Usually, you should delete everything after the second backslash in the ID (the unique serial number part).

Save and Install: Save the file in the same folder as cfadisk.sys. In Device Manager, right-click your drive and select Update Driver > Browse my computer > Let me pick > Have Disk, then select your edited cfadisk.inf. 

Warning: Using this driver on 64-bit systems can be risky as it may require disabling driver signature enforcement and can potentially cause boot issues. 

The process involves "tricking" the Windows Hardware ID selection process.