3
INTRODUCTION
GENERAL FEATURE
SPECIFICATIONS
1. MODEL: GCR-8481B
1) SUPPORTED SYSTEM
• IBM Compatible 486SX or Above (With PIO mode 4 recommended)
2) SUPPORTED OS
3) GENERAL PERFORMANCE
• Data Transfer Rate .........................................................................................Sustained Data Transfer Rate
20Times Speed (Inner side) : 3,000 kbytes/sec
48 Times Speed (max., Outer side) : 7,200 kbytes/sec
• Data Buffer Capacity.....................................................................................................................128 kbytes
• Average Access Time ........................................................................Random Access Time : 75 ms Typical
4) POWER REQUIREMENTS
• Voltage ......................................................................................................................................+5V DC +5%
+12V DC +5%
• Ripple ..................................................................................................................+5V : Less than 100mVp-p
+12V : Less than 100mVp-p
• Current .......................................................................................................................+5V : 0.9A (Maximum)
+12V : 1.5A (Maximum)
5) AUDIO PERFORMANCE
• Frequency Response.....................................................................................................20Hz~20KHz(+3dB)
• S/N Ratio (IHF-A+20 KHz LPF) .......................................................................80 dB (Typical at 1 KHz 0dB)
75 dB (Limit at 1 KHz 0dB)
• T.H.D. (IHF-A+20 KHz LPF) ............................................................................0.05% (Typical at 1 KHz 0dB)
0.15% (Limit at 1 KHz 0dB)
• Channel Separation (IHF-A+20 KHz LPF) .............................................................................80 dB (Typical)
70 dB (Limit)
• Output Level (1kHz 0dB) 47K
Ω
Load ....................................................................................0.7Vrms + 10%
• Headphone Level (1kHz 0dB) 33
Ω
Load...............................................................................0.7Vrms + 20%
• Enhanced IDE interface
• Internal 5.25 inch, halfheight CD-ROM Drive
• Fast 75ms Average Access Time
• Max 7,200KB/sec Sustained Transfer rate (GCR-8481B)
• Max 7,800KB/sec Sustained Transfer rate (GCR-8521B)
• Photo-CD Multisession Disc Spec compliant
• Multimedia MPC-3 Spec compliant
• Power Tray Loading/Ejection Mechanism
• 3 Way Eject support
(Software, O/C Button, Emergency Eject)
• Closed Enclosure
• Built-in ATAPI Interface Controller
• Software Volume Control
• 8 Times Digital Filter for CD Audio
• Built-in MODE-1 ECC/EDC
• MTBF 125,000h POH (at 10% Utilization)
• PIO Mode 4 & Multi DMA Mode 2 support
• Horizontal or Vertical Mounting
• Digital audio output connector
• Digital audio through ATAPI Interface
• Subcode (P-W) through ATAPI Interface
• Spin-down Mode for energy saving
• MS-DOS Version 3.1 or Higher
• Windows '95/'98/’2000/Me/XP
• Solaris Ver 2.4 or Higher
• Linux slackware Ver 2.3
• Windows NT 4.0 or later
• OS/2 Warp (Ver 3.0)
This service manual provides a variety of service
information. It contains the mechanical structure of
the CD-ROM Drive together with mechanical
adjustments and the electronic circuits in schematic
form. This CD-ROM Drive was manufactured and
assembled under our strict quality control standards
and meets or exceeds industry specifications and
standards.
