For batch processing, developers often use a or script to pull these files into a single compressed archive for easier handling. For Developers

Are you planning to use these records for training or for a clinical analysis study?

In the context of arrhythmia research, these records represent specific patient ECG data:

Locate the file list where you can find individual .dat , .hea , and .atr files for records 201 and 205.

While you may see requests for these in .rar format on third-party forums, the most reliable way to obtain them is directly from official scientific repositories like PhysioNet : Navigate to the MIT-BIH Arrhythmia Database page.