Ideal for IT techs needing to "mass-image" multiple identical machines.
If you want the raw disk image (unmodified sector-by-sector copy), the is the safest public source. Look for "macOS High Sierra 10.13.5 original DMG."
You're looking for a macOS High Sierra 10.13.5 image file. download macos high sierra 10.13.5 image file -.rdr-
Requires R-Drive Image to open; you cannot use Disk Utility natively.
Do you have to create the installer?
: It is the native format for R-Drive Image, R-Studio , and related recovery utilities.
If you are looking for a macOS High Sierra 10.13.5 image file with the extension, you have likely encountered a niche but powerful disk imaging format. Unlike standard Apple .dmg or .iso files, the .rdr format is proprietary and often used in specific data recovery or backup scenarios. What is a .rdr File? Ideal for IT techs needing to "mass-image" multiple
Official macOS installers are typically distributed as files, not extension is a proprietary disk image format used by R-Tools Technology software, such as R-Drive Image Understanding the ".rdr" File If you have found a macOS High Sierra image with an extension, it was likely created using R-Drive Image rather than Apple's standard tools. R-Drive Image
Apple’s content caching servers keep historic builds. You can try to pull the specific InstallMacOS.pkg for 10.13.5 using curl (though Apple rotates URLs frequently). Requires R-Drive Image to open; you cannot use
Websites like MacRumors or TonyMacx86 often have legitimate links for older installation images meant for virtual machines. Preparing the Image File for Installation
If you mean a concise filename or label for a macOS High Sierra 10.13.5 disk image with extension ".rdr", use one of these: