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Data cartridge capacity scaling
Inhibit firmware down-leveling
SAS interface
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USB interface
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The SET CAPACITY SCSI command enables a customer to capacity scale a data
cartridge to enable faster random access. As an example, a customer could capacity
scale a data cartridge to 20% of its normal length which improves the average
access time by almost a factor of 5; however, it also reduces the native capacity of
the tape to 300 GB.
The drive provides the capability to prevent loading and installing drive microcode
via a Field Microcode Replace (FMR tape) if the firmware level contained in the
FMR tape is older than the code level already installed. This option is controlled
by the host application. No checking will be performed if the firmware level is
loaded via the host interface or the library interface.
The drive has a dual port 6 Gbps SAS (Serial Attached SCSI) host interface, or an
optional single 6 Gbps SAS port and single USB 3.0 port (see "USB interface").
A drive with a SAS interface can be linked directly to controllers. SAS is a
performance improvement over traditional SCSI because SAS enables multiple
devices (up to 128) of different sizes and types to be connected simultaneously
with thinner and longer cables; its full-duplex signal transmission supports 6.0
Gb/s. In addition, SAS drives can be hot-plugged.
SAS drives auto-negotiate speed. There are no configurable topologies, thus no
feature switches associated with SAS.
Physical Characteristics
The drive contains a dual port, SFF-8088 SAS connector. A list of compatible cables
is shown in Appendix C, "Ordering Optional Features, Replacement Parts, Power
Cords, and Media," on page C-1.
The drive has a single SAS port and a single USB port host interface if the optional
Feature Code 5760 is ordered. The USB host interface supports USB 3.0
connectivity and can negotiate a "Super Speed" transfer rate. It also supports USB
2.0 connectivity at the slower transfer rates. The USB interface auto-negotiates
speed. There are no configurable topologies, thus no feature switches associated
with USB. The tape drive with SAS/USB ports requires a device driver for USB 3.0
operation.
Physical characteristics
The drive has a single port, USB 3.0 Type B connector. A USB 3.0 compatible cable
is required to connect at the USB 3.0 "Super Speed" transfer rate. A list of
compatible cables is shown in Appendix C, "Ordering Optional Features,
Replacement Parts, Power Cords, and Media," on page C-1.
Chapter 1. Product description
1-5
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