Replacement for 310504-B21: Drop-In Alternatives We Stock
Looking for a replacement for the 310504-B21 (310504-B21 - Compaq 73 GB 3.5 Internal Hard Drive - 1 Pack - Ultra320 SCSI - 10000 rpm)? 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 310504-B21
| SKU | 310504-B21 |
|---|---|
| Product | 310504-B21 - Compaq 73 GB 3.5 Internal Hard Drive - 1 Pack - Ultra320 SCSI - 10000 rpm |
| Current price | $617.50 |
| Stock status | In Stock |
| Detail page | View 310504-B21 › |
Drop-in replacements for 310504-B21
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.
KU073L8 - Maxtor Atlas 10K III 73.40 GB 3.5 Internal Hard Drive - 1 Pack - Ultra320 SCSI - 10000 rpm - 8 MB Buffer
SKU: KU073L8
Price: $80.72
91.AB033.061 - Acer 73 GB 3.5 Internal Hard Drive - 1 Pack - Ultra320 SCSI - 10000 rpm
SKU: 91.AB033.061
Price: $216.95
SO.07310.CS2 - Acer 73 GB Internal Hard Drive - 1 Pack - Ultra320 SCSI - 10000 rpm
SKU: SO.07310.CS2
Price: $216.95
KW073L8 - Maxtor Atlas 10K III 73.40 GB 3.5 Internal Hard Drive - 1 Pack - Ultra160 SCSI - 10000 rpm - 8 MB Buffer
SKU: KW073L8
Price: $364.50
06P5752 - IBM 73.40 GB 3.5 Internal Hard Drive - 1 Pack - OEM - Ultra160 SCSI - 10000 rpm - 8 KB Buffer
SKU: 06P5752
Price: $473.68
MAS3735NP - Toshiba Enterprise MAS3735 73.50 GB 3.5 Internal Hard Drive - 1 Pack - Ultra320 SCSI - 15000 rpm - 8 MB Buffer
SKU: MAS3735NP
Price: $478.49
272673-B21 - Compaq 36.40 GB 3.5 Internal Hard Drive Ultra320 SCSI 15000 rpm
SKU: 272673-B21
Price: $357.89
S26361-F3208-E573 - Fujitsu S26361-F3208-E573 73 GB 2.5 Internal Hard Drive - 1 Pack - 3Gb/s SAS - 15000 rpm - 8 MB Buffer - Hot Pluggable
SKU: S26361-F3208-E573
Price: $432.36
E20S5P7U - Toshiba E20S5P7U 73 GB 3.5 Internal Hard Drive - 5 Pack - 3Gb/s SAS - 15000 rpm - Hot Swappable
SKU: E20S5P7U
Price: $432.36
E20S4P7U - Toshiba E20S4P7U 73 GB 3.5 Internal Hard Drive - 4 Pack - 3Gb/s SAS - 15000 rpm - Hot Swappable
SKU: E20S4P7U
Price: $432.36
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.