Most RAM-disk utilities bypass this problem by including an optional feature that automatically saves the contents of your RAM disk to a hard drive during shutdown, and then reloads the data to the RAM disk during startup. Since RAM disks are volatile, they lose their data every time the PC loses power. That means most people won’t be able to set up a RAM disk that’s larger than 4GB. Size limitations are a significant drawback: The size of the virtual drive is constrained by your system’s total RAM, and you’ll want to leave at least 4GB of memory untapped and available for general computer use (more is recommended). The storage capacity is severely limited in comparison with that of a standard hard drive, and the inherent volatility of random access memory can be a headache if you store important files or programs on your RAM disk. Of course, running important programs from a RAM disk has some notable disadvantages, too. Games run more smoothly from a RAM disk too, although coaxing Steam titles into working with a RAM disk is a bit of a hassle, and storing a whole game in a virtual drive requires a big chunk of memory. For example, moving Word, Excel, Firefox, and Acrobat off of my laptop’s 7200-rpm hard drive and onto a RAM disk resulted in the apps’ loading nearly twice as quickly, rivaling the opening speeds on an SSD-especially when opening large files. The biggest everyday performance gains occur when you fully install a program on a RAM disk. That makes a RAM disk a wonderful tool for hastening operations in which your machine must read and write a lot of data, such as media encoding or editing large batches of photos. RAM disk read/write speeds blow away the speeds of even top-of-the-line SSDs.
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