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ST31000640SS

ST31000640SS - 1TB SAS 7200RPM Enterprise HDD | Seagate

The Seagate ST31000640SS is a 1 TB enterprise-class 3.5-inch hard disk drive spinning at 7200 RPM with a SAS 3 Gb/s interface, designed for Dell PowerEdge servers and EqualLogic iSCSI SAN arrays. It belongs to the Seagate Barracuda ES.2 / Constellation ES family of nearline enterprise drives, using 4 platters with second-generation perpendicular magnetic recording to deliver 1 TB of raw capacity with proven 24x7 reliability. The drive is rated for 7200 RPM spindle speed, a 16 MB or 64 MB cache buffer (variant-dependent), and supports the SAS 3 Gb/s dual-port interface for redundant data paths in mission-critical server and storage-area-network deployments. A nearline SAS HDD is an enterprise-class hard drive optimized for bulk storage workloads where capacity, sustained throughput, and 24x7 availability matter more than ultra-low latency. SAS (Serial Attached SCSI) drives sit above consumer SATA drives in the storage hierarchy - SAS -> enterprise HDD -> nearline HDD -> desktop HDD - offering dual-porting, command queuing (TCQ), and stricter duty-cycle ratings. The ST31000640SS occupies the nearline tier: bulk capacity at spinning-disk economics with enterprise robustness for backup, archival, and tier-2 storage pools inside Dell PowerEdge servers and EqualLogic PS-series arrays. Key features include 1 TB formatted capacity, 7200 RPM spindle, SAS 3 Gb/s interface, average seek times around 8.5 ms read, and on-drive IOEDC/IOECC data protection. The 3.5-inch form factor plugs directly into Dell Gen-13 PowerEdge hot-swap caddies and EqualLogic PS-series shelves, making it a direct-replacement candidate when refreshing aging server pools. Average sustained transfer rates exceed 100 MB/s, while rotational vibration tolerance and dual-port SAS keep performance stable in dense multi-drive chassis. The drive architecture employs 4 platters with perpendicular recording, a dedicated servo system, and Seagate's PowerChoice idle power management. Native command queuing and tagged command queuing enable the host RAID controller to reorder I/O for higher throughput under mixed random/sequential workloads. The dual-port SAS interface delivers multipath I/O for redundant controller paths in EqualLogic SAN deployments. Typical applications include Dell PowerEdge R-series and T-series server primary boot and bulk storage volumes, EqualLogic PS6210E / PS4100E iSCSI SAN capacity expansion, nearline backup targets in SMB and remote-office data centers, RAID-5 or RAID-6 array members for archival storage, and Tier-2 capacity pools behind flash-accelerated read caches. The 1 TB capacity point and 3.5-inch form factor remain broadly deployed in legacy Gen-12/Gen-13 Dell fleets that still accept spinning disks. When designing with this drive, confirm the host backplane accepts 3.5-inch SAS drives at 3 Gb/s link rate and that the RAID controller firmware supports the drive's PI (SCSI Peripheral Interface) version. Mixed-capacity deployments inside a single EqualLogic shelf follow Dell's compatibility matrix - verify the existing shelf firmware revision before hot-adding older nearline drives to newer arrays. This page synthesizes distributor pricing, cross-brand same-capacity alternatives, and practical deployment notes beyond the Seagate product brief, with a focus on the legacy Dell PowerEdge and EqualLogic ecosystem where the ST31000640SS remains in active service.