Replacement for ST9402112A: Drop-In Alternatives We Stock
Looking for a replacement for the ST9402112A (ST9402112A - Seagate Momentus 40GB 2.5-inch Hard Drive ATA-100 4200RPM 8MB Cache)? 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 ST9402112A
| SKU | ST9402112A |
|---|---|
| Product | ST9402112A - Seagate Momentus 40GB 2.5-inch Hard Drive ATA-100 4200RPM 8MB Cache |
| Current price | $205.26 |
| Stock status | In Stock |
| Detail page | View ST9402112A › |
Drop-in replacements for ST9402112A
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.
ST9402113A - Seagate Momentus 4200.2 40GB 4200RPM IDE/ATA-100 8MB Cache 2.5-inch Hard Drive
SKU: ST9402113A
Price: $192.63
9AH417-196 - Seagate Momentus 4200.2 40GB 4200RPM ATA-100 8MB Cache 2.5-inch Hard Drive
SKU: 9AH417-196
Price: $238.54
ST94019A - Seagate Momentus 40GB 4200RPM ATA-100 2MB Cache 2.5-inch Hard Drive
SKU: ST94019A
Price: $346.88
9AH234-020 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 2.5-inch Hard Drive
SKU: 9AH234-020
Price: $121.26
9AH237-020 - Seagate Momentus 4200.2 60GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 2.5-inch Hard Drive
SKU: 9AH237-020
Price: $143.39
9AH439-304 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-304
Price: $189.47
9AH439-503 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-503
Price: $189.47
9AH439-501 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-501
Price: $189.47
9AH439-155 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-155
Price: $189.47
9AH439-500 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-500
Price: $189.47
9AH439-502 - Seagate Momentus 4200.2 100GB 4200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache (CE) 2.5-inch Hard Drive
SKU: 9AH439-502
Price: $189.47
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.