Seagate ST9420AG manual Pin 1 Pin 20 removed

Page 5

Marathon 420sl Installation Guide, August 1995	3

Master/slave configuration jumpers

	Pin 1 Pin 20 removed	Circuit board
	for keying	Circuit board
	for keying

B	D
A	C

Drive is master; slave may be detected using DASP– signal

Drive is master; Seagate slave drive present

Drive is slave; Seagate master drive present

Use CSEL pin grounding to differentiate master from slave

Figure 1. ATA interface connector and master/slave configuration jumpers

Image 5

Contents Marathon 420sl ST9420A, ST9420AG AT Interface Drives Contents Read before you begin Attaching cables Configuring the drivePin 1 Pin 20 removed Mounting the drive Configuring your computer Marathon 420sl Installation Guide, August Page Partitioning Formatting and partitioning the driveLow-level formatting High-level formatting General troubleshooting procedures Installation troubleshootingPage Screen remains blank when you power up the computer Specific Troubleshooting ProceduresAt startup, the message HDD controller failure appears ∙ Check for memory conflicts ∙ Check for viruses Page ∙ Check for viruses Compatibility notes SeaBOARD Technical support servicesLocation Telephone number Seagate’s internet connections Seagate 2.5-inch drive and approved packing materials Storing and shipping your drive