[ IDENTIFIED HDD // MODEL-SPECIFIC RECORD ]
Seagate Momentus 7200.3 ST9320421AS
320 GB; 2.5-inch mobile drive; SATA 3 Gb/s. This entry is limited to the complete model number shown here. Verify the label and firmware; similar family names are not interchangeable.
IDENTIFICATION: Record the full model suffix, serial number and firmware from the nameplate. Capacity or connector fit alone does not confirm an exact replacement or compatible sector presentation.
Recorded specifications
| Exact model / series | Seagate Momentus 7200.3 ST9320421AS |
|---|---|
| Formatted capacity | 320 GB (manufacturer nominal decimal capacity) |
| Form factor / height | 2.5-inch / 9.5 mm |
| Interface | Serial ATA, 3 Gb/s (SATA 2.0 generation; compatible operation depends on host negotiation and firmware) |
| Rotation / cache | 7,200 RPM / 16 MB buffer |
| Logical sector format | 512-byte logical sectors (512 B/sector); physical-sector reporting should be verified from the drive IDENTIFY data. |
| Recording technology | Manufacturer family documentation identifies perpendicular magnetic recording (PMR). The cited material does not establish the condition or exact head/media revision of any individual unit; do not infer SMR behavior. |
| Reliability note | Manufacturer family endurance/error figures are design-population ratings, not a prediction of this unit’s remaining life or a warranty of data integrity. SMART cannot guarantee future operation; keep verified independent backups. |
Host compatibility and handling caveats
- Use a host/controller that supports SATA devices and the drive’s 3 Gb/s link (lower SATA generations may negotiate a slower link); this is not a PATA/IDE device. The usual SATA data and power plugs do not supply laptop-specific mounting hardware.
- Check the system’s 2.5-inch bay and 9.5 mm clearance, 5 V supply, BIOS/UEFI capacity support, cable/bridge behavior and boot support. Older BIOSes, USB bridges or recovery tools may misreport capacity or sector geometry.
- The documented 512-byte logical sector size is not proof of every unit’s physical-sector reporting or firmware state. Query ATA IDENTIFY and the host’s sector view before cloning, repartitioning, RAID use, or installing an operating system.
- Do not treat a nominal 3 Gb/s link rate as sustained disk throughput. Sustained transfer varies by zone, condition, workload and host.
- If the disk clicks, disappears, spins down unexpectedly or returns read errors, stop unnecessary power cycles and writes. Preserve acquisition details; image read-only where safe and use a qualified recovery specialist if data is important.
Manufacturer sources
- Seagate Momentus 7200.3 SATA Product Manual, Rev. CManufacturer technical and installation manual; includes the 320/250 GB model variants. Confirm model suffix and document revision against the drive label.
- Seagate Momentus 7200.3 Data SheetManufacturer family data sheet for interface, dimensions and performance specifications. Use the exact model’s row rather than assuming every family feature applies to every variant.
Specifications are transcribed from the cited Seagate family-level documentation. Confirm the individual label and firmware before service or data migration.