The world's first 5.25-inch floppy drive was developed by Shugart Associates in 1976 for IBM's mainframe. It was later used in IBM's early PCs. In 1980, Sony introduced a 3.5-inch disk. By the early 90's, 3.5-inch, 1.44-MB floppy disks have been used for standard data transmission methods for PCs.
Early computers generally used a 5.25-inch floppy drive, and there were two main 5.25-inch floppy drives. A 5.25-inch double-sided high-density floppy drive (also known as 5.25-inch 1.2M floppy drive), can read and write 5.25-inch double-sided high-density floppy disk (1.2M), 5.25-inch double-sided low density floppy disk (360K), 5.25 inches single low density Floppy disk (180K). The other is a two-sided low density floppy drive, the main difference with the former is the inability to read and write 5.25 inches double-sided high density floppy disk (1.2M). Later it produced a 3.5-inch double-sided high-density floppy drive (also known as 3.5-inch 1.44M floppy drive), and can read and write 3.5-inch double-sided high-density floppy disk (1.44M) and 3.5-inch single-sided high-density floppy disk (720K). For a long time, the computer generally has two floppy drives, which are respectively a 5.25-inch 1.2M floppy drive and a 3.5-inch 1.44M floppy drive. Now it is generally only equipped with a 3.5-inch 1.44M floppy drive.
The common floppy drive is characterized by small capacity, high cost per unit of capacity, floppy disk error-prone, poor reliability, and slow speed. Notebooks generally use built-in 3.55" 1.44MB floppy or external floppy drive.
Early computers generally used a 5.25-inch floppy drive, and there were two main 5.25-inch floppy drives. A 5.25-inch double-sided high-density floppy drive (also known as 5.25-inch 1.2M floppy drive), can read and write 5.25-inch double-sided high-density floppy disk (1.2M), 5.25-inch double-sided low density floppy disk (360K), 5.25 inches single low density Floppy disk (180K). The other is a two-sided low density floppy drive, the main difference with the former is the inability to read and write 5.25 inches double-sided high density floppy disk (1.2M). Later it produced a 3.5-inch double-sided high-density floppy drive (also known as 3.5-inch 1.44M floppy drive), and can read and write 3.5-inch double-sided high-density floppy disk (1.44M) and 3.5-inch single-sided high-density floppy disk (720K). For a long time, the computer generally has two floppy drives, which are respectively a 5.25-inch 1.2M floppy drive and a 3.5-inch 1.44M floppy drive. Now it is generally only equipped with a 3.5-inch 1.44M floppy drive.
The common floppy drive is characterized by small capacity, high cost per unit of capacity, floppy disk error-prone, poor reliability, and slow speed. Notebooks generally use built-in 3.55" 1.44MB floppy or external floppy drive.
Incremental Encoder is commonly used, and Absolute Encoder is used if there are strict requirements on position and zero position. Servo system should be analyzed in detail, depending on the application situation. Commonly used incremental encoder for speed measurement, which can be used for infinite accumulation measurement; Absolute encoder is used for position measurement, and the position is unique (single or multiple turns). Finally, it depends on the application situation and the purpose and requirements to be realized.
Incremental Linear Encoders,Linear Optical Encoder,Linear Position Encoder,Encoder Bearing Tester
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