A CD is not a hard drive. Hard drives have error-checking built-in; if a sector is hard to read, the drive re-reads it until it gets the right answer. Audio CDs, however, were designed for the smooth, continuous playback of a stereo system. They used a simpler, real-time error correction scheme called CIRC (Cross-Interleaved Reed-Solomon Code). This could fix small scratches or dust, but if a section was too damaged, the drive wouldn’t try again—it would simply guess what the missing data should be, a process called . It would "conceal" the error by averaging the sound of the good samples before and after the bad one.
EAC worked like a paranoid, obsessive-compulsive librarian, not a casual jukebox. Its core innovation was a multi-pass, error-detecting method it called .
And the answer changed the way the world preserved its digital music. Every time someone makes a perfect, archival-quality backup of a rare CD, they are following a path first mapped out by a German programmer in 1998 who refused to accept a "good enough" copy. exact audio copy
Then, in 1998, a German programmer named decided to solve the problem. A computer science student with a passion for precise, deterministic software, Wiethoff was frustrated by the same issues. He believed that the data on an audio CD was, at its core, just data. The drive’s firmware was the problem—it was optimized for speed and silence, not for accuracy. It would give up too easily.
News of EAC spread like wildfire through the nascent file-sharing communities, but not for the reason you might think. While some used it to create pristine MP3s, its true home was among the archivists. It became the gold standard for preserving rare, out-of-print, or damaged discs. Got a 1980s CD that your toddler used as a skateboard? EAC could often save it. Want to archive your entire collection before the discs rot? EAC was the only tool you could trust. A CD is not a hard drive
Andre Wiethoff eventually stopped active development for a period, but he released the source code, ensuring EAC would live on. Today, while newer tools like CUETools and dBpoweramp have adopted similar secure-rip techniques, EAC remains the spiritual and practical foundation. It is the standard against which all other rippers are judged.
The story of Exact Audio Copy is not a story of sleek marketing or a disruptive startup. It is a proper story of a simple, stubborn question: "What if we just read it again, and again, and again until we got it right?" They used a simpler, real-time error correction scheme
He wrote a new program that would command the CD-ROM drive at the lowest possible level, using the drive’s native "SCSI" commands (even on ATAPI drives, which emulated SCSI). He called his creation .