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product page	view details	view details	view details	view details	view details	view details	view details
price	R 8,279.95	R 7,759.95	R 7,999.95	R 9,399.95	R 7,919.95	R 7,709.95	R 8,449.95
model	IronWolf Pro 12TB / ST12000NE0007	Ultrastar DC HC520 SATA / HUH721212ALE604	IronWolf 12TB / ST12000VN0008	WD Red Pro NAS 12TB / WD121KFBX	IronWolf Pro 12TB / ST12000NE0008	WD Red Plus 12TB / WD120EFBX	Exos X18 12TB SAS / ST12000NM004J
name	IronWolf Pro 12TB NAS Hard Drive (ST12000NE0007)	Ultrastar DC HC520 SATA 12TB Server Hard Drive (HUH721212ALE604)	IronWolf 12TB NAS Hard Drive (ST12000VN0008)	WD Red Pro NAS 12TB 3.5" Hard Drive (WD121KFBX)	IronWolf Pro 12TB NAS Hard Drive (ST12000NE0008)	Red Plus 12TB NAS Hard Drive (WD120EFBX)	Exos X18 12TB 3.5" SAS Enterprise Internal Hard Drive (ST12000NM004J)
details	* Designed for multi-bay NAS systems with Power balance + AcuTrac Technology * 1 to 16 bays * Sata 6Gb/s * 7200rpm * 256mb Cache * 1.2 M Mean Time Between Failures (MTBF) (hours)	* 3.5-inch form factor * SATA 6 Gb/s * 7200RPM * 256MB data buffer, 512e format * 2.5M hours MTBF rating and a 5-year limited warranty	* SATA3 * 3.5" form factor * 7200rpm * 256MB Cache	* SATA3, 3.5" form factor * 7200rpm * 256MB Cache * for NAS systems with up to 24-bays * 240MB/s Internal Transfer Rate * NASWare 3.0 Technology * multi-axis shock protection	* Designed for multi-bay NAS systems with Power balance + AcuTrac Technology * Up to 24-bay * Sata 6Gb/s * 7200rpm * 256mb Cache * 1.2 M Mean Time Between Failures (MTBF) (hours)	* 3.5" Form Factor * SATA III 6 Gb/s Interface * 7200RPM * 256MB Cache * Up to 196 MB/s Sustained Transfer Rate * CMR Recording Technology, Native command queuing, Advanced Format (AF), RoHS compliant * 1 Million Hours MTBF * Built and tested for up to 8-bay NAS systems * Supports up to 180 TB/yr workload rate * Small or medium business NAS systems in a 24x7 environment	* 12 Gb/s SAS * 7200 RPM * 512e/4Kn Sector Size (Bytes per Sector) * Cache, Multi-segmented (MB): 256 MB * Max. Sustained Transfer Rate OD (MB/s, MiB/s): 270/258 * Dual Interface Ports * MTBF: 2,500,000 * Power-On Hours per Year (24×7): 8,760
warranty	5 years	5 years	3 years	5 years	5 years	3 years	5 years
General
Model	IronWolf Pro 12TB	Ultrastar DC HC520 SATA	IronWolf 12TB	WD Red Pro NAS 12TB	IronWolf Pro 12TB	WD Red Plus 12TB	Exos X18 12TB SAS
Product Line	IronWolf Pro	Ultrastar DC HC500 Series	IronWolf	WD Red Pro NAS	IronWolf Pro	WD Red Plus	Exos X18
Drive Type	NAS	Server	NAS	NAS	NAS	NAS	Server
SSHD	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>
Form Factor	3.5 inch	3.5 inch	3.5 inch	3.5 inch	3.5 inch	3.5 inch	3.5 inch
Capacity	12 TB	12 TB	12 TB	12 TB	12 TB	12 TB	12 TB
Interface	SATA3	SATA3	SATA3	SATA3	SATA3	SATA3	SAS
Drive Format	<not specified>	4Kn 512e	<not specified>	<not specified>	<not specified>	<not specified>	512e 4Kn
Self Encrypting Drive (SED)	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>
Certification	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>
Performance
Rotational Speed	7200 rpm	7200 rpm	7200 rpm	7200 rpm	7200 rpm	7200 rpm	7200 rpm
Cache Size	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB	256 MB
Average Latency	4.16 msec	4.16 msec	<not specified>	<not specified>	4.16 msec	<not specified>	4.16 msec
Data Rate	250 MB/s	600 MB/s	210 MB/s	240 MB/s	250 MB/s	196 MB/s	270 MB/s
Random read seek time	<not specified>	8.0 msec	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>
Random write seek time	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>
Thickness	<not specified>	26 mm	<not specified>	<not specified>	26.1 mm	26.1 mm	26.1 mm
Optional Accessories
Rescue Plan	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>	<not specified>