Replacement for ST3400620A: Drop-In Alternatives We Stock
Looking for a replacement for the ST3400620A (ST3400620A - Seagate BarraCuda 400GB 7200RPM ATA-100 16MB Cache 3.5-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 ST3400620A
| SKU | ST3400620A |
|---|---|
| Product | ST3400620A - Seagate BarraCuda 400GB 7200RPM ATA-100 16MB Cache 3.5-inch Hard Drive |
| Current price | $641.42 |
| Stock status | In Stock |
| Detail page | View ST3400620A › |
Drop-in replacements for ST3400620A
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.
ST3400632A-RK - Seagate BarraCuda 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 16MB Cache 3.5-inch Hard Drive
SKU: ST3400632A-RK
Price: $560.25
ST3400633A - Seagate BarraCuda 7200.9 400GB 7200RPM ATA-100 16MB Cache 3.5-inch Hard Drive
SKU: ST3400633A
Price: $250.53
9BD045-304 - Seagate BarraCuda 7200.9 400GB 7200RPM ATA-100 16MB Cache 3.5-inch Hard Drive
SKU: 9BD045-304
Price: $391.87
9BD045-340 - Seagate BarraCuda 7200.9 400GB 7200RPM ATA-100 16MB Cache 3.5-inch Hard Drive
SKU: 9BD045-340
Price: $463.87
9Y7769-557 - Seagate BarraCuda 7200.8 400GB 7200RPM ATA-100 16MB Cache 3.5-inch Hard Drive
SKU: 9Y7769-557
Price: $503.09
9Y7485-516 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-516
Price: $385.47
9Y7485-904 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-904
Price: $385.47
9Y7485-760 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-760
Price: $385.47
9Y7485-765 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-765
Price: $385.47
9Y7485-780 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-780
Price: $385.47
9Y7485-840 - Seagate BarraCuda 7200.8 400GB 7200RPM IDE Ultra ATA/100 (ATA-6) 8MB Cache 3.5-inch Hard Drive
SKU: 9Y7485-840
Price: $385.47
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.