Alternative to 310506-B21: Better-Value Equivalents in Stock
Comparing the 310506-B21 (310506-B21 - HP 18 GB 3.5 Hard Drive Ultra-320 SCSI 15000 rpm) against alternatives? Pro Disk Network stocks 12 similar HP parts that offer comparable performance at different price points. Each option below is in-stock, US-warehoused, and tested-and-certified before ship. Bulk pricing is available on quantities of 5+; B2B procurement can use Net 30 with PO.
About the 310506-B21
| SKU | 310506-B21 |
|---|---|
| Product | 310506-B21 - HP 18 GB 3.5 Hard Drive Ultra-320 SCSI 15000 rpm |
| Current price | $503.09 |
| Stock status | In Stock |
| Detail page | View 310506-B21 › |
Alternatives to 310506-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.
271837-004 - HP 72.8GB 10000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive with Tray for BL20p G1/BL20p G2/BL20p G3/BL25p/BL40p Server
SKU: 271837-004
Price: $73.68
FE-23023-01 - HP 18.2GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: FE-23023-01
Price: $79.93
271831-014 - HP 72GB 10000RPM Ultra-320 SCSI Hot-Pluggable 3.5-inch Hard Drive
SKU: 271831-014
Price: $82.42
BF018863B8 - HP 18.2GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: BF018863B8
Price: $95.46
271837-005 - HP 146GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 271837-005
Price: $110.53
443188-001 - HP 72.8GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 443188-001
Price: $110.53
3R-A4017-AA - HP 18.2GB 10000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 3R-A4017-AA
Price: $113.57
271873-014 - HP 72.8GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 271873-014
Price: $115.41
360205-018 - HP 146GB 10000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 360205-018
Price: $115.41
404670-018 - HP 72.8GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: 404670-018
Price: $115.41
BF018863BB - HP 18.2GB 15000RPM Ultra-320 SCSI Hot-Pluggable LVD 80-Pin 3.5-inch Hard Drive
SKU: BF018863BB
Price: $120.45
How we pick alternatives
Every recommendation above was selected using these criteria:
- Spec parity — capacity, speed, port count, and form factor matched within a 10% tolerance
- Price spread — alternatives shown across the price range, so you can pick on budget
- Brand mix — both OEM-equivalent and trusted aftermarket, all certified
- Reliability data — preferred parts have failure rates below 1% in our 18-month return tracking
- In stock today — shipping today, not 4-6 weeks from now
Want a side-by-side spec comparison?
We can prepare a written comparison covering throughput, power draw, form factor and validated compatibility. Email sales@prodisknetwork.com or call +1 (407) 205-8454 — most quotes ship within 4 business hours.