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SQL Server error code

SQL Server error 3271

SQL Server raises error 3271 at severity 16, which marks a problem with the query or data that you can correct.

A nonrecoverable I/O error occurred on file "%ls:" %ls.
Msg3271
NameDMPIO_IO_ERROR
Severity16
Group3000–3999

What it means

This is a general error that occurs when the operating system raises an error while performing I/O during a backup or restore operation. In most situations the cause is simply that the backup medium is full.

Source: Database Engine events and errors