1 piece 15TB HDD 3.5\" SAS Western digitlal DC HC620 4Kn SMR SE

TheHGST Ultrastar DC HC620hard drives are based on Western Digital’s fourth-generation HelioSeal helium-filled enterprise platform that packs eight platters and employing multiple enhancements of internal components specially designed to improve reliability and durability of HDDs working in vibrating multi-drive environments. The DC HC620 HDDs use eight SMR platters with a 1.75 TB and a 1.875 TB capacity featuring a 1034 and a 1108 Gbit areal density per square inch respectively. Because of a very high areal density, the 14 TB version of the drive offers up to 233 MB/s sequential read/write speed, whereas the 15 TB variant can hit 255 MB/s sequential read/write speed, which is the worldrecord for any SMR HDD.

Keep in mind though how SMR technology works - it records new magnetic tracks partly overlapping the previously recorded tracks in a \'shingle roof tile\' fashion. This method is appropriate for sequential writes, but as multiple tracks need to be adjusted when re-writes occur, it slows down the rewriting process. As a result, SMR-based HDDs are good enough for archive as well as write once read many (WORM) applications (think content delivery services), but is not suitable for typical server or enterprise workloads. Another thing to point out about high-capacity HDDs in general and Western Digital’s Ultrastar DC HC620 15 TB in particular is the fact that as capacities increase, IOPS per TB performance drops and it gets increasingly harder for operators of datacenters to guarantee their customers expected performance and quality of service. Therefore, while technically the Western Digital’s 15 TB is the world’s highest-capacity hard drive that exists today, it is necessary to understand that this is a very special product aimed at select customers with systems that take into account peculiarities of SMRandcan mitigate lower IOPS per TB performance to minimize impact on QoS.

Warranty

Returns of non-defective normally stocked items in resalable condition will be accepted for credit subject to a restocking charge of no less than 10% of the sales price.

• 30 days DOA
  

30 Days return

Shipping & Handling

• If the package is over $750, it must required adult signature according to policy. You are responsible to sign for the items when it arrives. If package returns back to us due to missing your signature, we will charge you 10% for restock fee.
• Hawaii, Alaska, and outside of US, please ask for the actual shipping cost.
• Buyer is responsible for all custom fees and/or import taxes.

Payment and Terms

• PayPal
• We only ship the item when the payment is cleared, and the tracking number will be send to confirmed PayPal\'s email.
• Please read the description carefully and be sure this is the item that you want before making the offer.
• If it\'s not stated on the listing, meaning that it\'s NOT included, so please do NOT assumption.... if you have question or any confusion, feel free to ask!!!
• Payment must be make with in six days after the sale is ended. Fail to complete the payment, I will file a dispute with to get our listing fee back.