| 17 || Last block || Tape only, set to 0
|-
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| 18 || File type || 0:=BASIC , 1:Protected 2:=Binary (ASCII files don't have headers but a fake header is built in memory with the file type #16, "Unprotected 2=Screen image, 3=ASCII v1"), 4..7 are unallocated
|-
| 19..20 || Data length || The number of data bytes in the data record. As per cassette