Seagate ST9500621SS 500GB SAS Hard Drive

Seagate Part #/MPN: ST9500621SS

DiscTech Item #: SGT-ST9500621SS-BN-5Y

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Enterprise Grade

Capacity: 500GB

Speed: 7,200RPM

Interface Types: SAS Serial Attached SCSI

Form Factor: 2.5inx15mm SFF Server Drive

Encryption/SED Supported

Sector Size: 512 / 512e

Sustained Throughput: 115

Average Seek Time: 8.5/9.5

Electrical Interface: SAS-2 Serial Attached SCSI v2 - 6.0Gbps

On-Board Cache: 64MB

Seagate ST9500621SS 500GB 2.5in 6Gbps 7.2K RPM NL SED Constellation.2 SAS HDD – Brand New

Seagate ST9500621SS 500GB 2.5" 6.0 Gbps 7200 RPM Nearline Self-Encrypting Drive Constellation.2 Serial Attached SCSI Hard Disk Drive – Brand New

Constellation.2™ - Design Small and Deliver BIG—2.5-Inch, Eco-Friendly Nearline Drive

Key Advantages

  • Second generation of the first 2.5-inch, mainstream capacity, 15mm z-height, nearline enterprise drive for space-constrained data centers.
  • Choose 6Gb/s SAS for data integrity, scalability and fast data access.
  • The industry’s highest-reliability 7200-RPM drive, designed for 24×7 operation with MTBF of 1.4M hours and AFR of 0.62%.
  • Enterprise-class firmware features and best-in-class rotational vibration tolerance maximize system availability and performance.
  • Lowest operating power (under 6.4W) and enhanced PowerChoice™ options for additional power savings during slow or idle periods; Workload Management™ technology helps systems keep drives cool.
  • Self-Encrypting Drive (SED) option (AES-256) cuts IT drive retirement costs while securely protecting data where it lives—on the drive.


This drive is compatible with any server that accepts 2.5"x15mm (SFF Hard Drive) SAS Drives.

Drive ModelST9500621SS
InterfaceSAS 6Gbps
SED ModelYes
SED (AES-256) FIPS 140-2 Model No
Protection InformationYes
Low HalogenYes
Reliability/Data Integrity
Mean Time Between Failures (MTBF, hours)1.4 million
Reliability Rating @ Full 24x7 Operation (AFR)0.62%
Nonrecoverable Read Errors per Bits Read1 sector per 10E15
Power-On Hours per Year8760
Bytes per Sector512, 520, 528
Spindle Speed (RPM)7200
Cache, Multisegmented (MB)64
Interface Access Speed (Gb/s)6.0, 3.0, 1.5
Max. Sustained Transfer Rate (MB/s)115
Seek Time, Average Read/Write (ms)8.5/9.5
Average Latency (ms)4.16
Interface PortsDual
RV Tolerance (rad/s to 1800Hz)16
Power Management
Idle Power (W)3.27
Typical Operating, Random Read (W)5.6
Power Supply Requirements+12V and +5V
PowerChoice™ Technology (W)As low as 1.87
Temperature, Operating (°C)5 to 60
Vibration, Operating, <400Hz (Gs)0.5
Vibration, Nonoperating, <500Hz (Gs)3.0
Shock, Operating, 2ms (Gs)70
Shock, Nonoperating, 1ms and 2ms (Gs)400
Acoustics, Typical Idle (bels)2.2
Acoustics, Typical Seek (bels)2.8
Height (in/mm)0.591/15.00
Width (in/mm)2.76/70.10
Depth (in/mm)3.955/100.45
Weight (lb/g)0.403/183

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ROHS Compliant

Weight: 1.5 lb

Warranty: 5 Year Manufacturer

Brand New

Condition Levels Explained

The product is brand new.

5 Year Manufacturer Warranty

Product Warranties Explained

The product has a manufacturer warranty for the time period specified.