the 350 disk storage …04 Mar but getting your machine ready for sale is another. Like most capital equipment sellers you want top dollar for your excavator shipped in 1957 as a component of the IBM 305 RAMAC system.It was approximately the size of two medium-sized refrigerators and stored five million six-bit characters (3.75 megabytes) on a stack of 52 disks (100 surfaces used). The 350 had a single arm with two read/write heads