Primo Ramdisk Overview

What Is Primo Ramdisk?

Primo Ramdisk is a disk emulation program, able to create virtual disks by using physical memory. All Windows read and write requests to these virtual disks are completed in memory. Because access speed of physical memory is so much faster than most kinds of storage devices, this greatly speeds up your computer with reduced access time to files, which in turn, shows a huge improvement in overall performance.

Primo Ramdisk features a host of powerful functions and options maximizing performance and applicability. Primo Ramdisk supports up to 128 virtual disks. Each virtual disk can identify itself to Windows as a real physical hard disk or as a logical disk. It can be formatted with any Windows supported file system. Furthermore, Primo Ramdisk allows you to customize file system settings if necessary.

Primo Ramdisk also provides strong ability to rapidly save/restore ramdisk contents to/from an image file. Thus a ramdisk's contents can be preserved across computer restarts, in spite of the volatility of physical memory.

In addition, Primo Ramdisk offers unique features to effectively and efficiently manage system memory. It is able to dynamically allocate or release system memory for ramdisks, making better use of memory. Primo Ramdisk also implements the Unified Invisible Memory Management Interface (UIMMI) to create ramdisks from Invisible Memory, thereby overcoming the Windows limits on amount of system memory and allowing all installed physical memory to be fully utilized.

Besides ramdisks, Primo Ramdisk also supports to create hybrid-disks and file-disks, greatly extending its functionality.

How It Works

Primo Ramdisk Principle

Main Features

Disk Features

Memory Features

File System Features

  • Supports FAT/FAT32/exFAT/NTFS file systems.
  • Supports user-defined cluster size.
  • Supports user-defined volume label, serial number and drive letter.
  • Supports user-defined folders.
  • Supports user-defined NTFS file system settings (compression, indexing, and permission).

Image File Features

  • Supports image file format: Flat/Compact/Compressed Image.
  • Supports load/save functions:
    Load Only, Save at Shutdown, Save at Hibernate, Save at Sleep, Save Before Removal, Timing Save, and Manual Save.
  • Supports Delay Load mode.
  • Supports Quick Save mode.

Other Features

* Not all editions of Primo Ramdisk support the listed features. For a complete feature comparison among editions, see Edition Comparison.

Supported Operating Systems

  • Windows 11 (all editions, 32/64-bit)
  • Windows 10 (all editions, 32/64-bit)
  • Windows 8.1/8 (all editions, 32/64-bit)
  • Windows 7 (all editions, 32/64-bit)
  • Windows Vista (all editions, 32/64-bit)
  • Windows XP (all editions, 32/64-bit)

Additionally, Primo Ramdisk Server also supports the following operating systems.

  • Windows Server 2022 (all editions)
  • Windows Server 2019 (all editions)
  • Windows Server 2016 (all editions)
  • Windows Server 2012/2012R2 (all editions)
  • Windows Server 2008/2008R2 (all editions, 32/64-bit)
  • Windows Server 2003/2003R2 (all editions, 32/64-bit)