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Cheetah 36 Installation Guide, Rev. A

Data bus widths

These drives have a wide (16-bit) SCSI data bus. You can use these drives on a non-wide (8-bit) data bus if you provide proper termination to the upper eight data lines. This is often referred to as providing “high-9 termination” (the other bit is for parity).

The following table lists the maximum cable lengths and number of devices using single-ended and LVD I/O circuits.

Table 1.

SE and LVD bus configurations

 

 

 

 

SCSI

 

Maximum

 

 

number of

 

driver

I/O transfer rate

Maximum cable

devices on

type

(Mbytes/s)

length allowed

bus

 

 

 

 

 

 

 

SE

20

16

6 meters (19.7 ft.)

 

 

 

 

SE

40

4

3 meters (9.8 ft.)

 

 

 

 

SE

40

8

1.5 meters (4.9 ft.)

 

 

 

 

LVD

80

16

12 meters (39.4 ft.)

 

 

 

 

Providing adequate cooling

The enclosure design must ensure adequate cooling for the drive. The maximum ambient temperature allowed is 50°C.

The drive’s product manual (83329440) describes how to evalu- ate the air-flow design. The evaluation consists of ensuring that the case temperature of certain critical components remains within acceptable limits during drive operation.

Figure 2 shows two design approaches with one or more fans used to generate air flow. The air-flow patterns can be created

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Seagate ST136403LW/LC manual Data bus widths, Providing adequate cooling, SE and LVD bus configurations
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ST136403LW/LC specifications

The Seagate ST136403LW/LC is a vintage hard disk drive that belongs to Seagate's esteemed lineup of storage solutions. Known for its reliability and performance during the era of its release, this model caters to various computing needs, particularly in enterprise and industrial settings.

One of the standout features of the ST136403LW/LC is its capacity of 36.4 GB, which, although modest by modern standards, was quite impressive in the early 1990s. This size made it ideal for businesses at the time looking to store substantial amounts of data without the high costs associated with larger enterprise solutions.

The drive operates at a speed of 7200 RPM, allowing for efficient data access and transfer. The spindle speed is crucial for performance, and 7200 RPM was considered rapid for hard drives in that period. This enhanced speed translates to quicker read and write times, making it suitable for applications that require timely data retrieval.

The ST136403LW/LC utilizes the SCSI interface, a popular choice in server environments for its robustness and speed. SCSI technology facilitates the connection of multiple drives, providing the ability to network various devices and manage them effectively. The multi-device capability is particularly beneficial for enterprise applications, ensuring that data centers can efficiently manage resources.

In terms of physical characteristics, the ST136403LW/LC is a 3.5-inch form factor drive, a standard size that fits into most desktops and servers of its generation. This compatibility is vital for users looking to upgrade their existing systems without the need for significant modifications.

The drive also includes built-in error correction features, enhancing data integrity and reliability, crucial for business operations where data loss can lead to substantial repercussions. Additionally, it employs a sealed enclosure design, providing protection against dust and moisture, thereby extending the drive's lifespan in demanding environments.

Furthermore, Seagate's reputation for durability is echoed in the ST136403LW/LC, as it was designed to endure the rigors of everyday use, particularly in enterprise settings where uptime is critical.

In conclusion, the Seagate ST136403LW/LC serves as an essential piece of technology from its era, characterized by its 36.4 GB capacity, 7200 RPM speed, SCSI interface, and robust construction. While modern storage solutions have far surpassed its capabilities, this drive remains a testament to Seagate's legacy in the storage industry, reflecting the innovations of its time.
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