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Linear PCM audio is a high fidelity, uncompressed digital sampling of an analog audio signal.

PCM sampling is the method of choice for DVD movie soundtracks, as well as hi fi audiophile music production. Unlike mp3 and other highly compressed formats, PCM strives to emulate the original analog sine wave as closely as possible.

Recovering PCM files from Zoom H4n/H6 or Tascam recorders

Popular PCM audio recorders

Linear PCM audio is not difficult to repair when it is alone in the file:
Linear PCM can be found in audio files, usually in a variety of containers with the following extensions: .m4a .mp4a .mov .aiff .wav .mxf

Linear PCM is also widely used in professional video formats. Audio scraping, audio video sync and long audio files can be a challenge when repairing such files.

Linear PCM can have several subtypes:

resolution can be, from coarse to fine: 8 bits, 16 bits, 24 bits (integer) or 32 bits (float or integer).
byte order is either little-endian or big-endian
there can be one or several channels, each channel can be mono or stereo
sampling frequency can be, from coarse to fine: 8000, 11050, 16000, 22050, 32000, 44100, 48000

Example of description given by QuickTime Player:
16-bit integer (Big Endian), Stereo, 48.000 kHz

Detection

Treasured can detect Linear PCM in damaged audio files, but it doesn't "preview" it.

How to repair a damaged Linear PCM file?

The easiest way is certainly to ask your Treasured Repair Service to help you recover the unplayable audio file.
But for those who can program, here you have a few tips:

If the damaged file contains both video and audio, first you need to separate audio by scraping.
Then the audio raw data can be re-wrapped in an AIFF file quite easily.