DatacenterDisk
Dell

M40TH 8TB SAS 12G 512E

M40TH
PowerEdge OEMnearlineCMR8TBSAS-12G3.5"
$30.59/TB
$244.75
newIn Stock
Updated Mar 25, 2026, 05:51 AM
Buy on Amazon →
Quick Verdict

The Dell M40TH 8TB SAS 12G 512E is a 8TB SAS-12G enterprise drive at $30.59/TB - CMR recording makes it safe for all RAID levels and NAS deployments. New unit with full manufacturer warranty.

Specifications

Capacity8TB
Form Factor3.5"
InterfaceSAS-12G
Recording TechCMR
RPM7200
Cache—
Sector Size512e
Workload Rating—
Warranty—
ASINB086Q2NCC1

90-Day Price History

$17$25$3303/2304/3006/05
How it compares - 8TB SAS-12G
#1Dell M40TH 8TB SAS 12G 512ETHIS DRIVE
$18.75/TB
#2Seagate Enterprise Capacity 8TB SAS 12G
$21.88/TB
#3Dell 8TB SAS 12G 512e 3.5
$23.13/TB
#4HGST Ultrastar He8 8TB SAS 12G
$24.88/TB
#5HP 834031-B21 8TB SAS LFF
$27.38/TB

Compare to similar 8TB SAS-12G drives

Seagate
Enterprise Capacity 8TB SAS 12G
$21.88/TB
$175.00
REFURB
Dell
8TB SAS 12G 512e 3.5
$23.13/TB
$185.00
REFURB
HGST
Ultrastar He8 8TB SAS 12G
$24.88/TB
$199.00
REFURB
HP
834031-B21 8TB SAS LFF
$27.38/TB
$219.05
new
HP
834031-B21 8TB SAS LFF
$27.38/TB
$219.05
REFURB

Frequently Asked Questions

Yes. The M40TH 8TB SAS 12G 512E 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
8TB 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 4 hours for 8TB. 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 Dell 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 8TB 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.