HP

HP 695510-B21 4TB SAS 6G

695510-B21
ProLiant OEMnearlineCMR4TBSAS-6G3.5"
$13.75/TB
$55.00
newNot available
Price updated
Price accurate as of Sep 3, 2026, 08:31 PM
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 every few hours

DriveCapacityInterfaceRecordingCondition$/TBPrice
HP 695842-001 4TB SAS 6G
695842-001
4TBSAS-6GCMRNEW$15.00$60Buy
HGST HUS726040ALS210 4TB SAS 12G
HUS726040ALS210
4TBSAS-12GCMRREFURB$16.15$65Buy
Dell 012GYY 4TB SAS 6G Renewed
012GYY
4TBSAS-6GCMRREFURB$21.25$85Buy
WD WD Purple 4TB WD40PURX
WD40PURX
4TBSATA-6GREFURB$22.25$89Buy
Dell DRMYH Compellent 4TB NL SAS Renewed
DRMYH
4TBSAS-6GCMRREFURB$22.50$90Buy
WD Ultrastar 7K4000 4TB SATA NAS
HMS5C4040ALE640
4TBSATA-6GCMRREFURB$24.73$99Buy

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
HP 695842-001 4TB SAS 6GSAS-6GNew$15.00$59.99Buy
HGST HUS726040ALS210 4TB SAS 12GSAS-12GRefurb$16.15$64.59Buy
Dell 012GYY 4TB SAS 6G RenewedSAS-6GRefurb$21.25$85.00Buy
WD WD Purple 4TB WD40PURXSATA-6GRefurb$22.25$88.99Buy

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

Model context

Part of the HP line we track.

Quick Verdict

The HP 695510-B21 4TB SAS 6G is a 4TB SAS-6G enterprise drive at $13.75/TB - CMR recording makes it safe for all RAID levels and NAS deployments. New unit with full manufacturer warranty.

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Specifications

Capacity4TB
Form Factor3.5"
InterfaceSAS-6G
Recording TechCMR
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 695510-B21 4TB SAS 6GTHIS DRIVE
$13.75/TB
#2HP 695510-B21 4TB SAS 6GTHIS DRIVE
$13.75/TB
#3HP 695842-001 4TB SAS 6G
$15.00/TB
#4Dell 202V7 4TB SAS 6G Near Line
$21.00/TB
#5Dell 012GYY 4TB SAS 6G Renewed
$21.25/TB

Frequently Asked Questions

Yes. The 695510-B21 4TB SAS 6G uses CMR recording which is fully compatible with all RAID levels.

Warranty varies by seller. Check the Amazon listing for current warranty terms.

Compatible with any server or workstation equipped with a SAS HBA or SAS backplane. Tested with Dell PowerEdge, HPE ProLiant, Supermicro and IBM System x platforms.

Use Case Scenarios

🏠
Home & SMB NAS
Building a mid-range NAS for media, backups and file sharing.
✓ Excellent fit
CMR recording is RAID-safe and fully compatible with Synology, QNAP, TrueNAS and UnRAID. 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.