Introduction; Drive Overview - Seagate STT20000N Product Manual

Introduction

Introduction

Drive overview

STT20000N Product Manual
The Seagate internal STT20000 SCSI minicartridge drive extends the Seagate
family of one-inch high, DC2000 drives that feature high performance, high
reliability, and quiet operation. The STT20000 SCSI minicartridge drive transfers
data at up to 60 megabytes per minute (Mbtyes/min) without data compression.
With optimal system resources available, and with compressible data structures,
nominal transfer rates of up to 120 Mbytes/min can be observed using software data
compression (assumes 2:1 compression ratio). An additional feature of the
STT20000 SCSI minicartridge drive is an option for Read While Write and Hardware
data Compression. These features are available on the NS series (STT20000N-C).
Highlights of these features are contained in various parts of this Product
Description Manual.
Optimal system resources include but are not limited to:
•
Allocating the maximum amount of the base 640-Kbyte memory available
•
Not using a memory manager program
Note: During backup tasks, screen savers can have a negative affect on transfer
rates.
Data compression is available within the Seagate Backup Exec software package
for DOS and Windows and typically provides for a 2:1 compression ratio. The
compression ratio is dependent on the specific system and the nature of the files
being compressed.
Using FastSense TM , a unique Seagate feature, the STT20000 SCSI minicartridge
drive automatically senses the fastest available data transfer rate of the host system
and selects from three discrete speeds: 1,000, 733, or 489 kilobytes/second
(Kbyte/sec). This process maximizes system throughput by eliminating tape
repositioning, which is typically required when the tape drive operates faster than
the host computer.
The product is available as an internal device in either a 3.5-inch or 5.25-inch
configuration. The internal drive form factors are tailored for easy installation in
today's computers, and the full-featured embedded SCSI controller facilitates easy
integration into a variety of systems.
The drive contains an embedded, single-ended Small Computer Systems Interface
(SCSI) controller that supports SCSI ( ANSI X3.131, 1986) and SCSI-2 ( ANSI
X3.T92) . The drive supports numerous popular SCSI controller boards and
embedded devices including those from Adaptec and DPT. The drive provides
synchronous or asynchronous SCSI and a high speed burst rate of 5 Mbyte/second.
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