The Seagate ST1581N is a 3.5-inch internal hard disk drive designed for early enterprise servers, workstations, and SCSI storage environments. It provides approximately 525 MB of storage capacity and operates at around 4,400 RPM, using a Fast SCSI-2 interface with a 50-pin connector for reliable compatibility with legacy SCSI controllers and systems.
This drive was part of Seagate’s early generation of enterprise SCSI hard drives used in servers and industrial computing platforms where dependable storage and stable data transfer were required. Its design includes a segmented buffer and enterprise-class error management features typical of SCSI drives from the early 1990s.
Key Features
Manufacturer: Seagate
Part Number: ST1581N
Product Type: Enterprise Hard Disk Drive
Capacity: 525 MB
Interface: Fast SCSI-2 (50-Pin)
Rotational Speed: 4,400 RPM
Cache: 256 KB
Form Factor: 3.5″ Half-Height (HH)
Application: Enterprise servers, legacy workstations, industrial systems
Technical Specifications
Storage Capacity: 525 MB (formatted)
Drive Interface: Fast SCSI-2
Interface Connector: 50-Pin SCSI
Cache Buffer: 256 KB look-ahead buffer
Rotational Speed: ~4,400 RPM
Form Factor: 3.5″ internal drive
Average Seek Time: ~14 ms
External Transfer Rate: up to 10 MB/s synchronous
Drive Type: Internal enterprise HDD
Bytes per Sector: 512
Power Requirement: 5 V / 12 V
Usage: Legacy servers, workstation storage, industrial SCSI systems
Series: Early Seagate enterprise SCSI drives
