Overview of the Seagate SCSI Ultra320 Hard Drive
The ST3146707LC Cheetah is a high-performance hard drive designed for use in enterprise-level storage systems. Manufactured by Seagate, one of the leading manufacturers of hard drives, this particular model has a storage capacity of 146GB (gigabytes), spins at 10,000 RPM (revolutions per minute), and features a Small Computer System Interface (SCSI) Ultra320 interface with an 8MB buffer. This article will provide a detailed explanation of the features and specifications of the ST3146707LC Cheetah, its form factor, and how it is used in computer systems.
Features and Specifications
The ST3146707LC Cheetah has a storage capacity of 146GB, which means it can store up to 146 billion bytes of data. This makes it suitable for use in large enterprise-level storage systems that require high-capacity drives. It also spins at a speed of 10,000 RPM, which is significantly faster than standard desktop hard drives that typically spin at 7200 RPM. The faster spin speed means that data can be accessed more quickly, resulting in faster read and write speeds.
The ST3146707LC Cheetah also features a SCSI Ultra320 interface, which is a high-speed interface that allows data to be transferred at up to 320 megabytes per second. This is much faster than standard interfaces such as IDE (Integrated Drive Electronics) and SATA (Serial Advanced Technology Attachment), which have transfer speeds of up to 133 megabytes per second and 600 megabytes per second, respectively. The SCSI interface is particularly well-suited for use in enterprise-level storage systems that require high-speed data transfer.
The ST3146707LC Cheetah has a Large Form Factor (LFF) form factor, which means that it is designed to fit into larger storage systems such as servers and workstations. The LFF form factor measures 3.5 inches in width, which is the standard size for hard drives used in enterprise-level storage systems. The drive also features an 80-pin connector, which is used to connect the drive to the SCSI interface.
The LFF form factor is particularly well-suited for use in large storage systems because it allows for more drives to be packed into a smaller space. This means that storage systems can hold more data in a smaller physical footprint, which is particularly important in data centers where space is at a premium.
Use in Computer Systems
The ST3146707LC Cheetah is designed for use in enterprise-level storage systems, such as servers and workstations. These systems typically require high-capacity, high-performance hard drives that can handle large amounts of data and high levels of usage.
The ST3146707LC Cheetah is particularly well-suited for use in these systems because of its high-speed interface and large buffer. The SCSI Ultra320 interface allows data to be transferred at very high speeds, which is important in enterprise-level systems where data is frequently accessed and transferred. The large buffer also helps to ensure that data is transferred efficiently, resulting in faster transfer speeds.
General Information about the Seagate ST3146707LC
- Manufacturer : Seagate
- Model Number or SKU# ST373454LC
- Product Type : Hard Disk Drive (HDD)
- HDD Type : Ultra320 SCSI
- Form Factor : 3.5 Inches
- Capacity : 146 GB
- Interface Type : SCSI
- Connector : 80 pin HD D-SUB
- SCSI Signaling Type : Low Voltage Differential LVD
- Buffer Size : 8 MB
- Drive Transfer Rate : 320 MBPS External / 118 MBPS Internal
- Seek Time : 4.7 MS Average
- Track-to-Track Seek Time : 0.2 MS
- Average Latency : 3 MS
- Spindle Speed : 10000 RPM
Expansion / Connectivity
- Interfaces 1 x Ultra320 SCSI - 80 pin HD D-SUB HD-80
- Compatible Bays 1 x internal - 3.5 Inches
Dimension and Weight
- Width : 4 Inch
- Depth : 5.8 Inch
- Height : 1 Inch
- Weight : 1.52 LBS
About Refurbished Products
The ultra320 SCSI hard drive generation is the immediate upgrade of its predecessor, the ultra160 SCSI. The newer generation ultra320 SCSI HDD comes about as an implementation of the SCSI-3 Parallel Interface-4 (SPI-4) standards.
Over its lifetime, the SCSI standard is widely used in servers and high-end workstations. It is possible to install SCSI HDDs in a desktop PC that has one or more IDE disk drives. The IDE drive acts as the boot drive, while the SCSI hard drive provides additional storage capacity. SCSI is not commonly used in desktop PCs, although it allows the addition of a scanner and several other drives such as DVD-RAM, CD-Rs, and Zip drives to a single SCSI cable chain. USB and FireWire have gradually replaced the SCSI as alternate interfaces in the latest desktop PCs.
In-network servers, SCSI allows for the setting up of several hard drives in the RAID configuration to reduce the risk of loss of data. The configuration supports hot-swapping - the changing of hard drives while the system is still operating.
Ultra320 SCSI HDD just as the name suggests delivers 320 Mbps top speed and provides a faster bus at 80 MHz and a wider data path at 16 bit. Connections with the Ultra320 SCSI HDDs just like with SCSI devices can be daisy-chained since they have two ports - the incoming and the outgoing cables. Besides, SCSI has a strong commitment to backward compatibility with previous generations, which explains its widespread use as an I/O interface and the elimination of the need for substantial investments in equipment and infrastructure. Migration to the ultra320 SCSI HDD is smooth whether it is from the Ultra160 SCSI or other generations of the SCSI standard because of backward compatibility.
The ultra320 SCSI hard drive takes on technologies such as domain validation, cyclic redundancy check, and dual-edge clocking first introduced by ultra160 SCSI. Additionally, the ultra320 SCSI hard drive introduces protocol changes and other technologies that enhance performance and support reliable data transfer speeds at 320 Mbps. We have the following ultra320 SCSI HDD options: 146GB-10K RPM, 146GB-15K RPM, 300GB-10K RPM, 300GB-15K RPM, 36GB-10K RPM, 36GB-15K RPM, 73GB-10K RPM, 73GB-15K RPM, and 18GB-15K RPM to meet your performance and storage requirements.
The standard features of the ultra320 SCSI hard drive include:
- Two-fold increase in transfer speed: The ultra320 SCSI hard drive increases the transfer rate by 100% from the previous generation at the rate of 320 Mbps. The technology allows greater transfer rates, effectively leading to greater performance in environments of extended data transfer and support for many devices on a single bus.
- Support for SCSI packet protocol: By enabling packet protocols, the ultra320 SCSI HDD helps to reduce command overhead by using dual transition (DT) data phases to transfer data, commands, and statuses rather than asynchronous phases that are generally slow. Packet protocol allows for the transfer of multiple commands in one connection as well as increased performance through minimal command overhead and maximum bus utilization.
- Quick Arbitration and Selection (QAS): the technology helps reduce control release overhead between devices at the SCSI bus. QAS is all about reducing command overhead and maximizing utilization of the bus.
- Read/Write Data Streaming facilitates the reduction of overhead associated with data transfer through the sending of a LUN Q-TAG (LQ) data stream packet, which is subsequently followed by multiple data packets. Greater write data streaming is achieved since the bus turnaround delay is eliminated between LQ and data packets.
- The flow control feature facilitates the initiator to enhance the pre-fetching of data for writes and enhance the flushing of FIFOs for reads.
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In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).
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