Replacement for ST35120A: Drop-In Alternatives We Stock
Looking for a replacement for the ST35120A (ST35120A - Seagate 5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 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 ST35120A
| SKU | ST35120A |
|---|---|
| Product | ST35120A - Seagate 5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 3.5-inch Hard Drive |
| Current price | $82.42 |
| Stock status | In Stock |
| Detail page | View ST35120A › |
Drop-in replacements for ST35120A
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.
9K2005-302 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-302
Price: $74.09
9K2005-653 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-653
Price: $87.28
9K2005-637 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-637
Price: $139.00
9K2005-601 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-601
Price: $139.00
9K2005-308 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-308
Price: $139.00
9K2005-002 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-002
Price: $139.00
9K2005-304 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-304
Price: $211.97
9K2005-652 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-652
Price: $211.97
9K2005-305 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-305
Price: $237.49
9K2005-602 - Seagate Medalist 6531 6.5GB 5400RPM IDE Ultra ATA/33 (ATA-4) 128KB Cache 3.5-inch Hard Drive
SKU: 9K2005-602
Price: $382.59
9AF351-011 - Seagate 1.5GB 3600RPM IDE Ultra ATA/33 (ATA-4) 2MB Cache Hard Drive
SKU: 9AF351-011
Price: $294.75
9AF351-999 - Seagate 1.5GB 3600RPM IDE Ultra ATA/33 (ATA-4) 2MB Cache Hard Drive
SKU: 9AF351-999
Price: $294.75
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.