Recorded Patterns; Format Of A Track - Seagate STD124000N Product Manual

Tape Formats
Product Manual
DDS-3 Track Specifications
Parameter
Average Track Pitch
Variations of Track Pitch
Track Width
Nominal
Measured
Track Angle
Track Length
Ideal Centerline
Azimuth Angle
Positive
Negative

Recorded Patterns

The host data, which has already been transformed as described in the subgroup
section above and is contained within the main data fragments, is translated into
channel bits for recording to tape. The DDS-3 format specifies that each 8-bit byte
of the data found in the main data fragments is translated into a 10-bit pattern.
These 10-bit patterns are referred to as channel bits.

Format of a Track

Each individual track is made up of two margin zones , a preamble zone and a main
data zone.
Track Format
Zone Contents
Margin Zone No. 1 Margin Pattern
Preamble Zone Preamble Pattern
Main Data Zone Recorded Main Data Fragments
Margin Zone No. 2 Margin Pattern
Specification
9.053 µm ± 0.045 µm
2% maximum
9.053 µm
9.1 µm ± 1.8 µm
6° 22' 39.6"
23.521 mm ± 0.047 mm
1.900 mm from the
Tape Reference Edge
20° 00' 39.6" ± 15' 00.0"
19° 59' 20.4" ± 15' 00.0"
Chapter 6
Number of 10-bit Patterns
640
64
12,768
640
Page 51