Replacement for 1ET166-991: Drop-In Alternatives We Stock
Looking for a replacement for the 1ET166-991 (1ET166-991 - Seagate 3TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 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 1ET166-991
| SKU | 1ET166-991 |
|---|---|
| Product | 1ET166-991 - Seagate 3TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 3.5-inch Hard Drive |
| Current price | $458.74 |
| Stock status | In Stock |
| Detail page | View 1ET166-991 › |
Drop-in replacements for 1ET166-991
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.
1ET164-991 - Seagate 2TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 3.5-inch Hard Drive
SKU: 1ET164-991
Price: $302.36
1ET162-991 - Seagate 1TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 3.5-inch Hard Drive
SKU: 1ET162-991
Price: $402.12
ST3000VX006 - Seagate Surveillance 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000VX006
Price: $165.79
ST3000DM003 - Seagate BarraCuda 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000DM003
Price: $191.58
1HH166-300 - Seagate Surveillance 3TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 3.5-inch Hard Drive
SKU: 1HH166-300
Price: $196.50
ST3000VX002 - Seagate Surveillance 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000VX002
Price: $250.53
ST3000VN000 - Seagate 3TB 5900RPM SATA 6Gb/s 64MB Cache NAS 3.5-inch Hard Drive
SKU: ST3000VN000
Price: $273.91
ST3000VN007 - Seagate IronWolf NAS 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000VN007
Price: $286.32
1H4167-505 - Seagate NAS HDD 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive for NAS SystemS
SKU: 1H4167-505
Price: $318.32
ST3000VX005 - Seagate Surveillance 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000VX005
Price: $326.96
ST3000VM002 - Seagate Video 3TB 5900RPM SATA 6Gb/s 64MB Cache 3.5-inch Hard Drive
SKU: ST3000VM002
Price: $392.99
1ET166-990 - Seagate 3TB 5900RPM SATA 6Gb/s 64MB Cache (CE) 3.5-inch Hard Drive
SKU: 1ET166-990
Price: $458.74
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.