● Two 3.5-inch hard drives, internal
● Two 3.5-inch hard drive (via externally facing storage flexbays)
● Two M.2 solid-state drives, internal
● Two M.2 solid-state drive (via externally facing storage flexbays)
NOTE: The system supports a maximum of two externally facing storage flexbay slots.
Table 12. Storage specifications
Storage type Interface type Capacity
2.5-inch, 7200 RPM, hard-disk drive SATA 3.0 500 GB
3.5-inch, 7200 RPM, hard-disk drive SATA 3.0 1 TB
3.5-inch, 7200 RPM, Enterprise hard-
disk drive
SATA 3.0 Up to 8 TB
M.2 2230, SSD, Class 35 PCIe NVMe Gen4 x4 256 GB
M.2 2280, SSD, Class 40 PCIe NVMe Gen4 x4 Up to 4 TB
M.2 2280, SSD, Class 40, Opal Self-
Encrypting Opal 2.0, FIPS
PCIe NVMe Gen4 x4 Up to 1 TB
RAID
For optimal performance when configuring drives as a RAID volume, Dell recommends drive models that are identical.
Table 13. RAID (Redundant Array of Independent Disks)
Type Supported
RAID 0 Yes
RAID 1 Yes
RAID 5 Yes
RAID 10 Yes
Precision 7865 Tower supports RAID with more than one hard drive
configuration.
Care must be taken to match not only the drive vendor, capacity, and class, but also the specific model. Drives from the same
vendor, with the same capacity, and even within the same class, can have very different performance characteristics for certain
types of IO operations. Thus, matching by model ensures that the RAID volumes are comprised of an homogeneous array of
drives that will deliver all the benefits of a RAID volume without incurring the additional penalties when one or more drives in the
volume are lower performing.
Media-card reader
The following table lists the media cards supported by your Precision 7865 Tower.
Table 14. Media-card reader specifications
Description Values
Media-card type
One SD-card 6.0 slot
Specifications of Precision 7865 Tower 17
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