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Scorpion 40 DDS-4 Product Manual
Drive Operation and Maintenance 27
Loading a cartridge ................................................................................................... 27
Unloading a cartridge................................................................................................ 27
Initializing a blank cartridge....................................................................................... 28
DDS cartridge compatibility....................................................................................... 28
Write-protecting a cartridge....................................................................................... 29
LED codes................................................................................................................. 29
Clean LED .......................................................................................................... 30
Media LED.......................................................................................................... 30
Drive LED ........................................................................................................... 30
LED Code summary ........................................................................................... 31
Cleaning the tape heads ........................................................................................... 31
When to clean the tape heads............................................................................ 31
How to clean the tape heads.............................................................................. 31
Automatic drive spin-down and write ........................................................................ 32
Operating the Drive in High temperature or humidity conditions............................... 32
Data compression..................................................................................................... 33
Loading revised firmware from Seagate firmware cartridges.................................... 33
Flash memory..................................................................................................... 33
Firmware download process............................................................................... 33
Theory of operations 35
Overview ................................................................................................................... 35
The STD1401LW drive mechanism.................................................................... 36
Motors and control circuits ........................................................................................ 38
Timing tracking circuitry...................................................................................... 38
Signal-processing electronics............................................................................. 38
Flash memory ........................................................................................................... 39
Sensors..................................................................................................................... 39
Read-After-Write ....................................................................................................... 39
Media Recognition System (MRS)............................................................................ 40
About the DDS data cartridge ................................................................................... 40
Data compression 43
Introduction ............................................................................................................... 43
Data compression—general............................................................................... 43
Data Compression Considerations..................................................................... 44
Hardware compression....................................................................................... 45
Data integrity ...................................................................................................... 45
DCLZ algorithm......................................................................................................... 46
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