The term disk operating system is identified in base64 scheme by the sequence ZGlzayBvcGVyYXRpbmcgc3lzdGVt, while the MD5 signature is equal to fda2216dbff5607e584587729f8a16c5. The ASCII encoding of disk operating system in hexadecimal notation is 6469736b206f7065726174696e672073797374656d.