Replacement for SESY3A21U: Drop-In Alternatives We Stock
Looking for a replacement for the SESY3A21U (SESY3A21U - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 2.5-inch Hard 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 SESY3A21U
| SKU | SESY3A21U |
|---|---|
| Product | SESY3A21U - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 2.5-inch Hard Drive |
| Current price | $149.87 |
| Stock status | In Stock |
| Detail page | View SESY3A21U › |
Drop-in replacements for SESY3A21U
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.
390-0382-02 - Sun 73GB 15000RPM SAS 3Gb/s 16MB Cache 2.5-inch Hard Drive
SKU: 390-0382-02
Price: $92.63
TA-SS1NG-73G15K - Sun 73GB 15000RPM SAS 3GB/s Hot-Pluggable 16MB Cache 3.5-inch Hard Drive
SKU: TA-SS1NG-73G15K
Price: $142.50
TA-SS1NG-73G15K-Z - Sun 73GB 15000RPM SAS 3GB/s Hot-Pluggable 16MB Cache 3.5-inch Hard Drive
SKU: TA-SS1NG-73G15K-Z
Price: $142.50
ST373455FSUN72G - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 3.5-inch Hard Drive
SKU: ST373455FSUN72G
Price: $142.50
SESY3A21Z-N - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 2.5-inch Hard Drive
SKU: SESY3A21Z-N
Price: $149.87
SEVX3A21U-N - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 2.5-inch Hard Drive
SKU: SEVX3A21U-N
Price: $149.87
SESY3A21U-N - Sun 73GB 15000RPM SAS 3GB/s 16MB Cache 2.5-inch Hard Drive
SKU: SESY3A21U-N
Price: $149.87
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.