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About This Manual

This is the product manual for DAT 72 and DDS-4 internal and external tape drives.
It describes how to use the DAT 72 and DDS-4 drives.

Following are brief descriptions of the sections in this manual.

Chapter 1, “Introduction” provides general specifications, features and an
overview on DDS technology.

Chapter 2, “Specifications” contains physical, performance, environmental,
reliability, and power specifications.

Chapter 3, “Installation” provides cautions, unpacking tips, inspection information
and installation/connection steps.

Chapter 4, “Drive Operation and Maintenance” explains the operation of the drive
and describes necessary maintenance procedures.

Chapter 5, “Theory of Operations” details the functional operation of various
assemblies of the drive.

Chapter 6, “Data Compression” describes the data compression algorithm and
explains pertinent information for effective use of data compression.

Содержание STD1401LW

Страница 1: ...DAT 72 and DDS 4 Tape Drives CD72LWH CD72LWE STD1401LW STD2401LW STD6401LW Product Manual...

Страница 2: ...s publication may be reproduced in any form without written permission from Certance LLC Certance provides this manual as is without warranty of any kind either expressed or implied including but not...

Страница 3: ...r are on different branch circuits If necessary you should consult the dealer or an experienced radio television technician for additional suggestions You may find the booklet How to Identify and Reso...

Страница 4: ...hysical performance environmental reliability and power specifications Chapter 3 Installation provides cautions unpacking tips inspection information and installation connection steps Chapter 4 Drive...

Страница 5: ...liability 12 Mean Time Between Failures 13 Mean Time to Repair 13 DDS Cartridge Specifications 13 Regulatory Compliance 14 Installation 15 Introduction 15 Unpacking and Inspection 15 Installing an Int...

Страница 6: ...y Conditions 32 Data Compression 33 Loading Revised Firmware from Seagate Firmware Cartridges 33 Flash Memory 33 Firmware Download Process via Tape 33 Theory of Operations 35 Overview 35 Drive Mechani...

Страница 7: ...v Contents Simplified Decompression Operation 48...

Страница 8: ...5 inch Configuration with mounting brackets 21 Figure 11 Interface Connector on an Internal Drive 22 Figure 12 Two SCSI Termination Examples for Internal Drives 22 Figure 13 Power Connector on the int...

Страница 9: ...ing and hardware data compression capability along with Seagate s proven computer grade design to provide unmatched reliability and performance characteristics among DDS products The DAT 72 and DDS 4...

Страница 10: ...3 81mm Wide Magnetic Tape Cartridge for Information Interchange Helical Scan Recording DDS 3 Format using 125 m Length Tapes The DDS 4 recording format specification from ECMA 288 3 81 mm Wide Magnet...

Страница 11: ...g components for improved immunity to airborne contaminants and extended media life Three available form factors 3 5 inch internal for installation in a 3 5 inch half height space 3 5 inch drive with...

Страница 12: ...nd DDS 4 models include A 3 5 inch half height drive that mounts internally see Figure 1 Figure 1 3 5 Inch Internal Drive A 5 25 inch half height drive that consists of a 3 5 inch drive with 5 25 inch...

Страница 13: ...Introduction 5 Figure 3 External Drive...

Страница 14: ...6 DAT 72 DDS 4 Product Manual...

Страница 15: ...cations Regulatory compliance Physical Specifications The physical specifications of the internal and external DAT 72 and DDS 4 models are listed in the following table Specification Internal Internal...

Страница 16: ...0 mm 0 83 in 2 places Side View Bottom View M3 0 x 4 deep min 10 places M3 0 x 4 deep min 4 places Note Tolerance for all dimensions is 0 25mm 0 01 in Figure 4 Internal Drive Dimensions 41 3 mm 1 63...

Страница 17: ...ax Operating Power 9 0 watts typical 10 0 watts max Surge start up 14 0 watts max Note Surge power and current are measured over a 20 msec period The following table lists pin assignments of the power...

Страница 18: ...mputer grade 4DD mechanism Head configuration 2 read heads 2 write heads Recording format DDS 5th Generation Recording method Helical scan Cartridge 73 66 mm 53 34 mm 10 16 mm Transfer rate sustained...

Страница 19: ...ype Computer grade 4DD mechanism Head configuration 2 read heads 2 write heads Recording format DDS 4 Recording method Helical scan R DAT Cartridge 73 66 mm 53 34 mm 10 16 mm Transfer rate sustained 5...

Страница 20: ...5 g 5 to 500 Hz Sweep Test 5 17 HZ 0 73 G peak 17 to 150 Hz 0 50 G peak 150 500 Hz sweep rate 8 decades per hour Acoustic level idling A wt sum 47 dBA maximum 0 Acoustic level operational A wt sum 53...

Страница 21: ...e field replaceable units If a problem occurs with a subassembly or component in the drive you should replace the entire unit Return the drive to the factory in its original packaging Contact your dis...

Страница 22: ...combination has been determined to be suitable by an appropriate certification organization for example Underwriters Laboratories Inc or the Canadian Standards Association in North America You should...

Страница 23: ...e describes how to install the external drive Unpacking and Inspection Although drives are inspected and carefully packaged at the factory damage may occur during shipping Follow these steps while unp...

Страница 24: ...ways lay the drive either on top of the antistatic bag or place it inside of the bag to reduce the chance of damage from static discharge Configuring an Internal Drive Before you install the tape driv...

Страница 25: ...ins 1 through 8 You can select the SCSI address used by the drive by placing the appropriate jumpers on pins pairs 1 2 through 7 8 as shown in Figure 6 The SCSI address can also be selected remotely b...

Страница 26: ...tails DIP Switch Settings Figure 7 shows the location of DIP switches on the underside of the internal drive Each of these switches is described in detail on the following pages If you change a DIP sw...

Страница 27: ...he drive does not perform a power on self test Operating System Configuration Switches 5 through 8 Switches 5 through 8 configure the drive for use with UNIX and other non Windows operating systems Se...

Страница 28: ...mage the drive As shown in Figure 9 the 3 5 inch drive has four screw holes on the bottom and five on each side Figure 8 Mounting an Internal Drive 41 3 mm 1 63 in 101 6 mm 4 00 in 101 6 mm 4 00 in 94...

Страница 29: ...ensions is 0 25mm 0 01 in Figure 10 Mounting Holes for an Internal Drive in a 5 25 inch Configuration with mounting brackets Connecting the SCSI Interface Cable DAT 72 and DDS 4 drives can be used wit...

Страница 30: ...SCSI device attach the drive to the connector which is next to last on the SCSI chain and attach a multimode terminator to the last connector in the chain SCSI Controller termination enabled Tape dri...

Страница 31: ...n power connector for the internal drive is an AMP 1 48024 0 housing with AMP 60617 1 pins or their equivalent Power connector pin 4 5V pin 3 GND 5V return pin 2 GND 12V return pin 1 12V Figure 13 Pow...

Страница 32: ...erating system Windows 98 Me XP NT 2000 2003 Server Termination power supplied to the SCSI bus Note Some of these configuration settings can be changed using the SCSI Mode Select command SCSI command...

Страница 33: ...drive is the last device or the only device in a SCSI chain you must install a terminating plug on the unused SCSI connector See Figure 15 for two SCSI termination examples External Tape Drive SCSI C...

Страница 34: ...26 DAT 72 DDS 4 Product Manual...

Страница 35: ...Caution To ensure the integrity of your backups and restores do not push the eject button while the drive status light emitting diode LED is ON See Figure 17 for the location of drive LEDs Make sure...

Страница 36: ...lizing a blank tape takes about 30 seconds DDS Cartridge Compatibility The Seagate DAT 72 and DDS 4 drives are designed to use data grade DAT cartridges which comply with ANSI specifications listed in...

Страница 37: ...n Figure 19 the front panel of the DDS drive contains three LEDs that provide information about both normal and error conditions The external drive also includes a green power on LED on the front pane...

Страница 38: ...as exceeded its useful life has been inserted into the drive Replace the cleaning cartridge with a new approved DDS cleaning cartridge Media LED The Media LED functions as follows If the Media LED is...

Страница 39: ...because the drive has been operating for at least 50 hours Flashing Slowly The internal error rate threshold has been exceeded and cleaning is required Flashing The cleaning cartridge in the drive ha...

Страница 40: ...ccurs normal operation resumes with no affect on the host operation If tape write operations cease a partially full data buffer may remain After one minute with no activity the drive automatically wri...

Страница 41: ...ition of switch number 1 see Data compression switches 1 and 2 in Chapter 3 When reading the drive automatically selects compressed or uncompressed mode depending on the data that is read Loading Revi...

Страница 42: ...rtridge as soon as the firmware has been completely downloaded into DRAM and the LEDs begin blinking with a progressive pattern When the blinking pattern stops the firmware upgrade operation is comple...

Страница 43: ...ICs for efficient circuit layout and increased reliability with low power consumption These LSIs are quad flat pack QFP designs that use complementary metal oxide semiconductor CMOS technology Using f...

Страница 44: ...The DAT 72 and DDS 4 drives come with a terminator power fuse to provide protection from component damage in case the SCSI cable is connected incorrectly Three rectangular front panel LEDs indicate a...

Страница 45: ...m In conventional recording such overlap or even proximity results in crosstalk signals from adjacent tracks interfering with signals from another track However in helical scan recording the heads are...

Страница 46: ...tracking and head positioning The timing tracking system in conjunction with the four head read after write RAW design provides for reliable high density data recording with maximum storage efficienc...

Страница 47: ...position during mode changes The capstan sensor is a magnetoresistive Hall sensor that detects a magnetic field The cylinder sensors are coil and magnet sensors Each reel motor contains a high resolut...

Страница 48: ...y distinguish them from audio grade media Audio grade media is not suitable for data or computer backup purposes Seagate DAT drives eject audio tapes About the Data Cartridge The tape drive is designe...

Страница 49: ...classify the media as data grade rather than audio grade media Figure 23 shows the four recognition holes that allow the drive sensors to identify the type of tape its magnetic thickness and whether...

Страница 50: ...42 DAT 72 DDS 4 Product Manual...

Страница 51: ...the information to tape The compression increases the amount of data that can be stored on a finite medium and increases the overall storage efficiency of the system With data compression the redunda...

Страница 52: ...be compressed and the starting pattern chosen The transfer rate depends on factors such as the compression ratio the drive buffer size the host computer input output I O speed the effective disc speed...

Страница 53: ...mpression algorithms but in this document they are divided into two basic types lossless algorithms such as DCLZ or ALDC and lossy algorithms such as those used in some consumer audio products Lossy a...

Страница 54: ...lly faster than the LZ1 type because the dictionary structure promotes efficient searching The DCLZ algorithm used in the DDS tape drive is based on the LZ2 LZW algorithm type described earlier in thi...

Страница 55: ...nique string found in the data stream The codeword for that string Codewords represent strings of up to 128 characters and are formed by adding a new character to an existing codeword These codewords...

Страница 56: ...ugh 22 are condition flag bits Dictionary codewords range from 9 through 12 bits in length and correspond to dictionary entries from 0 through 4 095 These entries are divided as follows First 512 entr...

Страница 57: ...words that are encoded bytes are output directly Codewords that are dictionary codes lead the algorithm through a series of bytes and codewords that point to other dictionary entries Bytes are stacked...

Страница 58: ......

Страница 59: ...Publication Number 50000712 Printed in USA...

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