: macOS High Sierra 10.13.5 was a minor update released in 2018 to add "Messages in iCloud" support.
The original drive cloned into the .rdr file used a different physical sector size (e.g., 512 bytes vs. 4Kn advanced format) than your new target drive.
Use an older version of the installer or download the specific 10.13.5 DMG to bypass this. top download macos high sierra 10135 image file rdr
Installing older operating systems can sometimes be problematic. Here are fixes for common errors:
. These files are frequently shared in Hackintosh communities to help users create bootable USB installers on Windows systems. Review of macOS High Sierra 10.13.5 : macOS High Sierra 10
The .rdr format is less common in official channels. For those who specifically need this format, advanced users often find it on specialized online archives. However, downloading unofficial system images carries significant security risks and is not recommended unless you are an expert and trust the source implicitly.
Are you deploying this image to a , a Hackintosh , or a Virtual Machine ? Do you already have the R-Drive Image software installed? Use an older version of the installer or
Deploying macOS onto non-Apple hardware using bootloaders like Clover or OpenCore. A pre-baked RDR image often includes universal configurations that make initial booting easier. Risks and Safety When Downloading RDR Files
The .rdr file extension is a proprietary disk image format natively generated by R-Drive Image , a popular disk cloning, backup, and deployment software utility.