different between irrecoverable vs unrecoverable

English

ir- +? recoverable

irrecoverable (comparative more irrecoverable, superlative most irrecoverable)

Not recoverable; incapable of being recovered.
an irrecoverable debt
That cannot be recovered from or made good; irremediable.
an irrecoverable disease; irrecoverable danger

irrecoverable in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
irrecoverable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.

un- +? recoverable

unrecoverable (not comparable)

Not recoverable; that cannot be recovered.
From which recovery is not possible.
The software crashed with an unrecoverable error, and I lost half an hour of work.

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