ขอบคุณ คุณเจษกับคุณเหน่งค่ะ
รบกวนปรึกษาค่ะ พอดีวันนี้เดินเจอ md player ที่ตลาดของเก่า ลองเล่นเครื่องทำงานปกติถาดหมุนก้อหมุนแต่มันขึ้น no disk อย่างนี้แปลว่าเสียมั้ยคะ ซื้อมา 100 บาท คนขายบอกลองเอาไปล้างหัวอ่านดู
ขอบคุณ คุณเจษกับคุณเหน่งค่ะ
รบกวนปรึกษาค่ะ พอดีวันนี้เดินเจอ md player ที่ตลาดของเก่า ลองเล่นเครื่องทำงานปกติถาดหมุนก้อหมุนแต่มันขึ้น no disk อย่างนี้แปลว่าเสียมั้ยคะ ซื้อมา 100 บาท คนขายบอกลองเอาไปล้างหัวอ่านดู
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ความคิดเห็นที่ : 359
Bua
20/06/2015 00:01:40
0
@rath2o ฝากเนื้อฝากตัวด้วยค่ะ
@rath2o ฝากเนื้อฝากตัวด้วยค่ะ
ให้กำลังใจ 0
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ความคิดเห็นที่ : 360
neng_ja
20/06/2015 00:14:32
48
คุณบัวครับ ลองถ่ายรูปมาดูทีครับว่ารุ่นไหน ใส่แผ่นแล้วยังขึ้น no disc
คุณบัวครับ ลองถ่ายรูปมาดูทีครับว่ารุ่นไหน ใส่แผ่นแล้วยังขึ้น no disc
Recordable MiniDiscs use a variation on conventional magneto- optical methods that Sony calls "Magnetic Field Modulation", in which data is recorded using a 4.5mW semiconductor laser together with a magnetic head. As the disc sweeps past the laser, a tiny area on the MD's magnetic recording layer is heated to its Curie temperature* while the field of the magnetic head in contact with the other side of the disc is switched back and forth to write a data pattern. When the area the head has magnetized moves away from the laser spot it cools below the Curie point to become cast in a string of N and S magnetized regions on the disc, spaced 60 millionths of a centimeter apart, and corresponding to the stream of bits being recorded.
Playback is accomplished using the same laser at about 1/10th power, and makes use of a phenomenon known as the Faraday effect in which a light beam's plane of polarization is rotated when it passes through a magnetic field. The readout laser beam is aimed at, and reflects from, the previously recorded magnetic regions; the optical pickup detects the polarization differences corresponding to beam reflection from N or S magnetized regions in order to reconstruct the recorded bit stream. (*The Curie temperature is the point at which a magnetic material loses coercivity, allowing it to be magnetized by a very weak field. For the MD recording layer [a compound of Terbium, Iron, and Cobalt], this temperature is 180°C).
Recordable MiniDiscs use a variation on conventional magneto- optical methods that Sony calls "Magnetic Field Modulation", in which data is recorded using a 4.5mW semiconductor laser together with a magnetic head. As the disc sweeps past the laser, a tiny area on the MD's magnetic recording layer is heated to its Curie temperature* while the field of the magnetic head in contact with the other side of the disc is switched back and forth to write a data pattern. When the area the head has magnetized moves away from the laser spot it cools below the Curie point to become cast in a string of N and S magnetized regions on the disc, spaced 60 millionths of a centimeter apart, and corresponding to the stream of bits being recorded.
Playback is accomplished using the same laser at about 1/10th power, and makes use of a phenomenon known as the Faraday effect in which a light beam's plane of polarization is rotated when it passes through a magnetic field. The readout laser beam is aimed at, and reflects from, the previously recorded magnetic regions; the optical pickup detects the polarization differences corresponding to beam reflection from N or S magnetized regions in order to reconstruct the recorded bit stream. (*The Curie temperature is the point at which a magnetic material loses coercivity, allowing it to be magnetized by a very weak field. For the MD recording layer [a compound of Terbium, Iron, and Cobalt], this temperature is 180°C).