Replacement for ST9640420AS: Drop-In Alternatives We Stock
Looking for a replacement for the ST9640420AS (ST9640420AS Seagate 640GB 7200RPM SATA 3Gb/s 2.5-)? 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 ST9640420AS
| SKU | ST9640420AS |
|---|---|
| Product | ST9640420AS Seagate 640GB 7200RPM SATA 3Gb/s 2.5- |
| Stock status | In Stock |
| Detail page | View ST9640420AS › |
Drop-in replacements for ST9640420AS
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.
9FZ164-033 - Seagate Barracuda 7200.11 640GB 7200RPM SATA 3Gb/s 16MB Cache 3.5-inch Hard Drive
SKU: 9FZ164-033
Price: $127.25
9FZ134-56B - Seagate BarraCuda 7200.11 640GB 7200RPM SATA 3Gb/s 32MB Cache (CE) 3.5-inch Hard Drive
SKU: 9FZ134-56B
Price: $157.88
9FZI34-568 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9FZI34-568
Price: $157.88
9FZI34-500 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9FZI34-500
Price: $157.88
9F2134-568 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9F2134-568
Price: $157.88
9F2134-300 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9F2134-300
Price: $157.88
9F2134-500 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9F2134-500
Price: $157.88
ST9640422AS - Seagate 640GB 7200RPM SATA 3Gb/s 16MB Cache 2.5-inch Hard Drive
SKU: ST9640422AS
Price: $192.08
9FZI34-300 - Seagate 640GB 7200RPM SATA 3Gb/s 32MB Cache 3.5-inch Hard Drive
SKU: 9FZI34-300
Price: $196.50
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.