Date: Thu, 24 Oct 1996 18:09:25 -0700 From: Paul Traina <pst@jnx.com> To: hackers@freebsd.org Subject: SCSI tape drive density codes and block sizes...? Message-ID: <199610250109.SAA04642@base.jnx.com>
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ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 0 int a irq 11 on pci0:16 ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs ahc0:A:0: refuses WIDE negotiation. Using 8bit transfers (ahc0:0:0): "QUANTUM FIREBALL1280S 630C" type 0 fixed SCSI 2 sd0(ahc0:0:0): Direct-Access 1222MB (2503872 512 byte sectors) ahc0: target 1 Tagged Queuing Device (ahc0:1:0): "Quantum XP34300W L912" type 0 fixed SCSI 2 sd1(ahc0:1:0): Direct-Access 4101MB (8399520 512 byte sectors) ahc0: target 2 Tagged Queuing Device (ahc0:2:0): "DEC DSP3210S 442A" type 0 fixed SCSI 2 sd2(ahc0:2:0): Direct-Access 2047MB (4194303 512 byte sectors) (ahc0:3:0): "HP C1533A 9503" type 1 removable SCSI 2 st0(ahc0:3:0): Sequential-Access density code 0x24, variable blocks, write-enabled ahc0:A:4: refuses WIDE negotiation. Using 8bit transfers (ahc0:4:0): "SONY CD-ROM CDU-76S 1.1c" type 5 removable SCSI 2 cd0(ahc0:4:0): CD-ROM cd0(ahc0:4:0): UNIT ATTENTION asc:28,0 cd0(ahc0:4:0): Not ready to ready transition, medium may have changed cd present [400000 x 2048 byte records] What exactly do the density codes for my DDS2 (HP C1533A) tape drive mean? What density code do I want to be using? Present Mode: Density = 0x24 Blocksize variable ---------available modes--------- Mode 0: Density = 0x00 Blocksize variable Mode 1: Density = X3.136-1986 Blocksize = 512 bytes Mode 2: Density = X3.39-1986 Blocksize variable Mode 3: Density = X3.54-1986 Blocksize variable thanks, Paul
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