Similarly, the recoverability of the system also indicates how well the system provides a “transparent failover” to standby nodes when the primary nodes fail. While the fault tolerance is achieved at the application level by graceful degradation of functionality, transparent load balancing is achieved at the hardware level using optimal load balancing algorithms. Few aspects of this are covered as part of “fault tolerance” and “transparent load balancing” discussed earlier. This attribute depicts how well the system recovers from an error scenario. Shailesh Kumar Shivakumar, in Architecting High Performing, Scalable and Available Enterprise Web Applications, 2015 2.8.3 Recoverability This is one part of making your evidence stand in a court of law. In order to record your findings in a legal digital forensic investigation, you must acquire a disk drive image using a reliable computer forensic tool such as ProDiscover ® Basic, FTK ® Imager, or any similar computer forensic program and then perform your data recovery. For example, most hard disks in Windows ® PCs use the NTFS file system, however USB flash drives usually use some variant of FAT (FAT16, FAT32, or exFAT). You should select the data recovery software according to the file system used on the drive you are recovering data from. For example, ProDiscover ® allows you to search inside file metadata for a specific keyword, which allows you to filter data very fast and save time. Not all data recovery software offers the facility to conduct a deep search as the one offered by many computer forensic tools. Recovering deleted data from one machine into itself may render your lost data permanently unrecoverable. It is better to unplug the hard drive of the PC you want to retrieve deleted files from then attach it to another PC that contains data recovery software. When using a data recovery tool, make sure you install this tool on a PC other than the one you want to recover data from. There are many free programs that perform this function keep in mind the following important things when using such tools: 1. If you do not prefer to use this method to recover deleted data (acquire an image and then investigate for deleted files using computer forensic tools like ProDiscover ® Basic), you can install data recovery software.
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