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RAID Arrays and External Drive Enclosures

External multi-bay RAID enclosures and SAS storage shelves for protected, shared or high-capacity storage on desks and in racks. 16 products from $29.99 to $11,647.99. DELL, LaCie, Synology Inc. and more.

16 products from $29.99

New to this? Buying server hardware with crypto — what to check, what it costs to pay, and what is never asked for.

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RAID levels: trading capacity for protection

RAID 0 stripes data across drives for speed, but any failure loses everything. RAID 1 mirrors two drives, halving capacity but surviving one failure. RAID 5 needs at least three drives and gives up one drive's worth of space for parity, while RAID 10 needs four and combines speed with mirroring. JBOD simply presents each drive separately. None of these replaces a backup: a deleted file or a damaged volume is copied or lost on every drive.

Interfaces and bays: how it connects, what goes inside

Thunderbolt, USB4 and USB-C enclosures attach directly to one computer. SAS in and out ports chain extra shelves to a server's controller. Check the bay size and drive type: SATA drives work in SAS bays, but SAS drives do not work in SATA-only bays. Some listings come with drives installed, shown by a capacity in the title, while others say drives are not included, so confirm whether you must supply 3.5-inch or 2.5-inch disks, and that the power supply covers your mains voltage.

Questions about RAID Arrays and External Drive Enclosures

RAID 1 or RAID 5 for a small enclosure?
Both survive one failed drive. RAID 1 uses two drives and offers half their space; RAID 5 needs three or more and gives more usable capacity, but rebuilds take longer and stress the remaining drives. Keep a separate backup either way.
Can I mix drive sizes in a RAID array?
In most arrays you can, but every drive is treated as the size of the smallest one, so the extra space on larger drives is wasted. Matching models and capacities keeps performance and capacity predictable.
What happens to my data if the enclosure itself fails?
In many arrays the drives can be moved to an identical or compatible enclosure, but this depends on the controller. Hardware RAID layouts are often tied to the vendor, so keep a backup elsewhere.