Replacement for LAC9000521: Drop-In Alternatives We Stock
Looking for a replacement for the LAC9000521 (LAC9000521 - LaCie 6TB 4big Quadra and 5big Thunderbolt Spare Drive)? Pro Disk Network ships 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 LAC9000521
| SKU | LAC9000521 |
|---|---|
| Product | LAC9000521 - LaCie 6TB 4big Quadra and 5big Thunderbolt Spare Drive |
| Current price | $911.76 |
| Stock status | In Stock |
| Detail page | View LAC9000521 › |
Drop-in replacements for LAC9000521
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.
LAC9000602 - LaCie Rugged 1TB Thunderbolt USB 3.0 External Solid State Drive
SKU: LAC9000602
Price: $1,006.47
Seagate STNA4000400 LaCie Rugged Pro5 4TB USB Type-C Thunderbolt 5 Max Read Speed 6700MB/s Max Write Speed 5300MB/s External Solid State Drive
SKU: STNA4000400
Price: $1,519.74
STFF2000400 - Seagate Lacie Bolt 3 2TB Thunderbolt 3 3.5-inch External Solid State Drive
SKU: STFF2000400
Price: $2,581.89
LAC9000491 - Seagate Rugged Thunderbolt 500GB USB 3.0 External Solid State Drive
SKU: LAC9000491
Price: $415.09
LAC9000490 - Seagate Rugged Thunderbolt 250GB USB 3.0 External Solid State Drive
SKU: LAC9000490
Price: $425.20
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.