To protect a minidisc against accidental erasure, Notes on recording, If "protected" appears in the display – Sony MDS-302 User Manual
Page 7: If "track" flashes in the display, When "toc" flashes in the display, If "din unlock" appears in the display, Marked in the two following ways, Recording on mds

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- MZ-N10 (136 pages)
- MZ-NF810CK (2 pages)
- MZ-N510CK (2 pages)
- MZ-NF810CK (2 pages)
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- MZ-NH600 (112 pages)
- D-NE900 (44 pages)
- D-NE10 (40 pages)
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- D-NF340 (2 pages)
- MZ-NF810CK (128 pages)
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- MZ-NH700 (116 pages)
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- CD Walkman D-EJ885 (40 pages)
- Walkman Radio Cassette Player WM-FX227 (2 pages)
- CD Walkman D-EJ360 (2 pages)
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- Atrac3/MP3 CD Walkman D-NF600 (44 pages)
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- AZ-HS1 (20 pages)
- ZS-H10CP (2 pages)
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- CD Walkman D-FJ65 (32 pages)
- ZS-D50 (96 pages)
- ZS-D50 (48 pages)
- CD Walkman D-EG7 (24 pages)
- BM-577 (6 pages)