Replacement for ST9120817AS: Drop-In Alternatives We Stock
Looking for a replacement for the ST9120817AS (ST9120817AS - Seagate Momentus 120GB 5400RPM SATA 3Gb/s NCQ 8MB Cache 2.5-inch Hard Drive)? Pro Disk Network ships Seagate drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the ST9120817AS
| SKU | ST9120817AS |
|---|---|
| Product | ST9120817AS - Seagate Momentus 120GB 5400RPM SATA 3Gb/s NCQ 8MB Cache 2.5-inch Hard Drive |
| Current price | $262.32 |
| Stock status | In Stock |
| Detail page | View ST9120817AS › |
Drop-in replacements for ST9120817AS
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
ST9200827AS - Seagate Momentus 200GB 5400RPM SATA 3Gb/s 8MB Cache NCQ 2.5-inch Hard Drive
SKU: ST9200827AS
Price: $167.53
ST9250827AS - Seagate Momentus 250GB 5400RPM SATA 3Gb/s NCQ 8MB Cache 2.5-inch Hard Drive
SKU: ST9250827AS
Price: $195.63
ST500LT012 - Seagate Momentus Thin 500GB 5400RPM 2.5-inch 7MM 16MB Cache SATA 3Gb/s NCQ Laptop Hard Drive
SKU: ST500LT012
Price: $68.42
9DG132-020 - Seagate Momentus 5400.4 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9DG132-020
Price: $205.26
9DG132-500 - Seagate Momentus 5400.4 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9DG132-500
Price: $226.08
ST9120310AS - Seagate Momentus 120GB 5400RPM SATA 3Gb/s 8MB Cache 2.5-inch Hard Drive
SKU: ST9120310AS
Price: $265.26
9HH131-500 - Seagate Momentus 5400.6 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9HH131-500
Price: $344.33
9HH131-120 - Seagate Momentus 5400.6 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9HH131-120
Price: $344.33
9DG132-285 - Seagate Momentus 5400.4 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9DG132-285
Price: $405.26
9DG132-566 - Seagate Momentus 5400.4 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9DG132-566
Price: $405.26
9DG132-188 - Seagate Momentus 5400.4 120GB 5400RPM SATA 3Gb/s 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9DG132-188
Price: $405.26
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.