Quantum DLT-S4 Betriebsanweisung PDF herunterladen (Seite 235)

Chapter 4 SCSI Commands

MODE SENSE (6) / (10) Command (1Ah / 5Ah)

DLT-S4 Interface Reference Guide 201

Data Security Mode Page

(27h)

Figure 106 shows the page that controls uses a password verification

mechanism to prevent or allow reading and writing the data to the tape.

Its primary function is to provide a means of preventing unauthorized

access to data on a DLT-S4 native cartridge. It has no impact on Back Read

cartridges.

The password is written to the drive using a

MODE SELECT command for

the Data Security Mode Page and read from the drive using a

MODE

SENSE command for the Data Security Mode Page. The password is

written to the tape in response to a

FORMAT command or WRITE

command when positioned at the beginning of the tape (

WRITE from

BOT).

The DLT-S4 drive checks for password protection on the DLT-S4 tape

during the load process and if it is enabled, verifies that the drive has the

same password. If the passwords match, the user can read and write data

on the tape. If they do not match,

READ and WRITE commands will be

rejected and sense data will be presented to the initiator.

Figure 106 Data Security Mode

Page — Data Format

Bit

7 6 5 4 3 2 1 0

Byte

0 PS (0) 0 Page Code (27h)

1 Additional Page Length (32h)

2 Reserved PAX PCP PWF Reserved CRA CWA

3 Reserved

4 Reserved Password Selection Scope

5 Reserved Action Code

6 Reserved

7 Reserved Number of Passwords Supported

8 — 9 Reserved APB APD PA TPP DPS PM

10 Reserved for Password 2 Status

11 Reserved for Password 3 Status

1 2 ... 230 231 232 233 234 235 236 237 238 239 240 ... 385 386

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Quantum DLT-S4 Betriebsanweisung Seite 235