This part is a kind of semiconductor called SFD-321B.

Function of this product has 3.5inch DUAL DENSITY MICRO FLOPPY DISK DRIVE.

Manufacturers : Samsung

Image and pinout :

Some of the text within the PDF file :

FDD OEM MANUAL SFD-321B 3.5inch DUAL DENSITY MICRO FLOPPY DISK DRIVE SPECIFICATIONS SEMA ELECTRONICS CO.,LTD XiaLingBei HengKeng Management Area Liaobu Town Dongguan City Guangdong Province, China SEMA ELECTRONICS CO.,LTD FLOPPY DISK DRIVE SPECIFICATION PAGE MODEL 1 SFD-321B CONTENTS 1. INTRODUCTION 1.1 Application 1.2 Disk Used 2. GENERAL SPECIFICATIONS 2.1 Performance 2.2 Environmental Conditions 2.3 Reliability 2.4 Power Supply 2.5 Physical Specifications 3. INSTALLATION 4. ELECTRICAL INTERFACE 4.1 Signal Interface 4.2 Power Interface 4.3 Interface Connectors 5. SIGNAL CHARACTERISTICS 5.1 Signal Level 5.2 Recommended Interface Circuit 5.3 Input Signals 5.4 Output Signals 6. TIMING DIAGRAM 6.1 Seek Operation Timing 6.2 Read / Write Operation Timing SEMA ELECTRONICS CO.,LTD FLOPPY D [ ... ]

SFD-321B PDF Datasheet Download