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2.Specification
SONY AIT-3Ex drive SDX-800V series Ver.1.1
2-11
2.5.1. Power Requirements
Voltage Max Ripple Current
Typical Maximum
5V ± 5% 100 mV p-p 1.5A 2.5A
12V ± 10% 150 mV p-p 0.75A 3.0A
* exclude SCSI terminator power
4.75V
T
10.8V
0V
0V
5V
12V
-300 ms <
T < 300 ms
Figure 2-5: Power-up Sequence
Note: Voltage has to increase constantly during Power-up until Maximum is reached.
Do not turn off the drive while the tape is in the drive.
2.6. Data Compression
The tape capacity is increased by compressing data prior to writing it to the tape. Data compression is a well
established technology for reducing the number of bits used to represent data in order to improve data transfer rate
as well as reduce the amount of storage space consumed by the data. The compression ratio depends on the source
file type. The SDX-800V uses the ALDC Data Compression algorithm. ALDC is ECMA standard data compression
algorithm. (ECMA-222) The Data Compression control page allows the host computer to enable data compression
and decompression and also configure the way in which the drive responds to compressed/uncompressed data
boundaries on the tape. The AIT-1, AIT-2, AIT-3 and AIT-3Ex Format allows both compressed and uncompressed
data to reside on the same tape.
The Sony SDX-800V has a DIP switch to disable the Data Compression/Decompression. After power-on reset with
this DIP switch set, both data compression and data decompression are disabled However, a MODE SELECT
command can override the setting of this DIP switch. After power-on reset without this DIP switch set, both data
compression and data decompression are enabled. (See clause 3.1.4)