HP

HP 695510-B21 4TB SAS 6G

695510-B21
ProLiant OEMnearline4TBSAS-6G3.5"
No current price
newNot available
Price updated
Price accurate as of Oct 19, 2026, 12:00 AM
No current offer

The HP 695510-B21 4TB SAS 6G is a 4TB SAS-6G HDD in new condition. It has no current offer on Amazon. The in-stock alternatives nearest its capacity are listed below.

In stock instead - nearest to 4TB

6 in-stock listings · this listing has no current offer on Amazon · ranked by live cost per tb, refreshed about once a day

DriveCapacityInterfaceRecordingCondition$/TBPrice
HP 846523-004 4TB SAS 12G Midline
846523-004
4TBSAS-12G—REFURB$30.00$120Buy on Amazon
Seagate SkyHawk 4TB ST4000VX007
ST4000VX007
4TBSATA-6GCMRREFURB$37.50$150Buy on Amazon
Dell 202V7 4TB SAS 6G Near Line
202V7
4TBSAS-6G—NEW$40.00$160Buy on Amazon
WD Ultrastar 4TB SATA4TBSATA-6G—REFURB$44.50$178Buy on Amazon
WD Purple 4TB WD40PURX
WD40PURX
4TBSATA-6G—REFURB$45.00$180Buy on Amazon
WD Red Plus 4TB WD40EFZX
WD40EFZX
4TBSATA-6G—REFURB$47.10$188Buy on Amazon

Where this listing sits: every 4TB hard drive · 4TB SAS drives · HP 4TB SAS — each page is the live ranking for that slice of the catalogue.

Part number: 695510-B21 — decoded, with sibling variants and the warranty check.

Before you buy: this is a SAS drive

SAS drives do not plug into a normal SATA motherboard port. You need a SAS host bus adapter or a backplane that speaks SAS - an LSI/Broadcom HBA in IT mode is the usual answer. A SATA drive will run on a SAS controller, but not the other way round. HBA and IT-mode guide

Same capacity, other options
DriveInterfaceCond$/TBPrice
HGST HUS726040ALS210 4TB SAS 12GSAS-12GRefurb$27.48$109.92Buy on Amazon
WD Purple 4TB WD40PURXSATA-6GRefurb$29.34$117.37Buy on Amazon
HP 846523-004 4TB SAS 12G MidlineSAS-12GRefurb$30.00$120.00Buy on Amazon
Seagate SkyHawk 4TB ST4000VX007SATA-6GRefurb$37.50$149.99Buy on Amazon

All 4TB drives we track, ranked by cost per terabyte.

Model context

CMR or SMR? What we can and cannot source for this part number

Part of the HP line we track.

Quick Verdict

The HP 695510-B21 4TB SAS 6G is a 4TB SAS-6G enterprise drive - Verify recording technology before use in RAID. New unit with full manufacturer warranty.

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Specifications

Capacity4TB
Form Factor3.5"
InterfaceSAS-6G
Recording Tech—
RPM7200
Cache—
Sector Size512n
Workload Rating—
Warranty—
ASINB07XB3B7QB
Market context

We do not have enough in-stock comparators of this type today to place this price against the rest of the market. The category page below ranks everything we do have.

Where the wider market has moved

These are third-party figures about the retail market as a whole, quoted and dated. They are not our own measurements and they do not describe this specific drive.

Compare against every 4TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 4TB SAS-6G
#1HP 695842-001 4TB SAS 6G
$17.00/TB
#2Dell DRMYH Compellent 4TB NL SAS Renewed
$22.50/TB
#3Dell 202V7 4TB SAS 6G Near Line
$40.00/TB
#4Seagate Constellation ES 4TB SAS 6G
$49.75/TB
#5HP 695510-B21 4TB SAS 6GTHIS DRIVE
Out of stock

Also appears in

SAS hard drives
Other pages

Frequently Asked Questions

Not right now: Amazon shows no current offer for ASIN B07XB3B7QB. The in-stock alternatives nearest its 4TB capacity are on this page, ranked by live price.

This listing (695510-B21, ASIN B07XB3B7QB) carries no renewed, recertified, refurbished or pulled claim in its title, and Amazon reports it as new. On this site that is what "new" means: sold as factory-new.

Use Case Scenarios

🏠
Home & SMB NAS
Building a mid-range NAS for media, backups and file sharing.
✓ Excellent fit
Verify CMR recording before using in RAID. New drives come with full warranty.
💾
Backup Server / Veeam Target
Dedicated backup storage for Veeam, Commvault, or NetBackup.
✓ Excellent fit
4TB SAS drives are ideal for backup targets. Dual-port SAS suits dual-path backup infrastructure.
🏗️
Virtualization Host Storage
VM images and snapshots on Proxmox, VMware or Hyper-V.
~ Good fit
Suitable for VM storage where workloads are not IOPS-intensive. SAS dual-port suits HA cluster shared storage. Consider NVMe cache for latency-sensitive VMs.

Maintenance & Troubleshooting

Maintenance Checklist

On installCheck SMART baseline on arrival
Run smartctl -a /dev/sdX and record: Reallocated_Sector_Ct, Power_On_Hours, Spin_Retry_Count. Establishes baseline for future comparison.
MonthlyRun SMART short self-test
smartctl -t short /dev/sdX — takes 1-2 minutes, catches most developing issues. Schedule during off-peak.
QuarterlyRun SMART long self-test
smartctl -t long /dev/sdX — full surface scan, takes 2 hours for 4TB. Any test failure is grounds for immediate replacement.
QuarterlyCheck RAID array health
Verify no degraded drives. A degraded array with no hot spare is one failure from data loss. Check mdstat or controller UI.
AnnuallyVerify drive firmware version
Check HP support site for firmware updates. Some versions have known bugs affecting integrity.
Every 3-5 yearsPlan proactive replacement
Enterprise HDDs have higher failure rates after year 4-5. At 4TB per drive, budget for replacements before failures occur.

Troubleshooting Guide

Cause: HBA not initialized, SAS expander issue, cable fault, or incompatible controller.
Fix: Verify HBA firmware. Check SAS topology with sas2ircu or StorCLI. Test with known-good cable. Confirm drive is SAS not SATA.