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The Hi-MD was too late. It allowed digital reading of the media and alternates to ATRAC, inc uncompressed. Sony deliberately made it impossible to digitally read even your own live recordings from mini-disc.
The MD-LP Atrac must have been 10:1 bit rate compression as it doubled play time. So standard ATRAC was 292 kbit/s, and LP 132 kbit/s. Later there were other ATRAC versions.
They also later had improved encoders producing files compatible with the earliest players.
Sony media execs just about crippled every Sony HW product.
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