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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchDirect-attached storage (DAS) is storage connected directly to the computer or server that uses it, rather than made available to that host through a network device. A USB external hard drive is a familiar example; a server can also connect to a multi-drive enclosure through a host bus adapter (HBA). DAS describes how storage connects, not how many drives it contains or what features it provides.
How direct-attached storage works
In a DAS setup, the storage device connects to a host—the computer or server accessing the data—over a supported interface. Cisco describes a typical server arrangement as a storage enclosure connected to a computer through an HBA. As Cisco puts it in its UCS Manager GUI Configuration Guide, Release 3.1, “Between those two points there is no network device (like a switch or router).” Cisco’s Direct Attached Storage documentation explains the connection arrangement.
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DAS may be a single drive or an enclosure containing several drives. Its physical size does not change the basic definition: the storage connects to the host that accesses it instead of being reached through a storage network.
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Common DAS examples and connections
External drive connected to a computer
A USB external hard drive plugged into a desktop or laptop is a straightforward example. Seagate describes a DAS drive as external storage attached directly through an interface such as USB or eSATA. Seagate’s BlackArmor DAS Drive FAQs gives this consumer-style framing.
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Multi-drive enclosure connected to a server
A server may connect to an enclosure holding multiple hard drives through an HBA. Cisco lists connection technologies including ATA, SATA, eSATA, SCSI, SAS, USB, USB 3.0, IEEE 1394 and Fibre Channel. These are examples from Cisco’s documentation, not a promise that any one host or enclosure supports every interface. The host controller, enclosure and drives must have compatible connections and support.
DAS vs. NAS vs. SAN
The central difference is how the host reaches the storage. DAS connects to a specific computer or server directly; NAS makes storage available to devices through a network-oriented file service; SAN architectures provide storage connectivity over a network. The label alone does not establish the speed, cost, reliability or redundancy of a particular product or setup.
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- Multiple RAID Configurations: The D2-320 is a hardware RAID enclosure and it supports RAID 0, RAID 1, JBOD and SINGLE which can better satisfy various demands of users. In RAID 1, data will be in a mirror backup. When there is a damaged hard drive, you can directly replace the hard drive, and the data will be recovered automatically. This provides an absolute security for the data
- Super-Large Storage Capacity: The D2-320 USB storage enclosure can support up to two 3.5" and 2.5" SATA HDD, as well as 2.5" SATA SSD, with a maximum capacity of 22TB per drive, providing users with up to 44TB (22TB x 2) of storage space
- Intelligent Temperature Control: The D2-320 HDD enclosure has an intelligent temperature-controlled and low-noise fan that automatically adjusts its speed based on the temperature of the hard disk. This feature ensures that the hard disk operates at its best temperature and provides better heat dissipation
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| Type | How storage is reached | Typical arrangement |
|---|---|---|
| DAS | Direct connection to the computer or server using the storage | USB external drive, or a multi-drive enclosure connected through an HBA |
| NAS | Over a network through the NAS’s file service | Networked storage accessed by devices configured to use it |
| SAN | Through a storage network | Networked storage connectivity; the architecture does not imply one particular protocol |
A DAS device connected to a NAS is still directly attached to that NAS. The NAS may then share the attached storage with other devices using its own software and configuration. Seagate documents this arrangement for its NAS OS, including connecting DAS over USB or eSATA. Its guidance on recognized filesystems, shares and safe removal is specific to that product documentation, not a universal rule for all NAS devices. Seagate’s NAS Ports And Direct-Attached Storage instructions describe the product-specific steps, including choosing Eject before disconnecting the device.
What to check before choosing DAS
For a particular setup, check the equipment and workload rather than assuming that the DAS label guarantees a specific capability.
Quick Recap
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- Hardware RAID supports RAID 0, 1, 5, JBOD, and individual disks
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- 5 EMPTY 3.5in BAYS - DRIVES NOT INCLUDED: This is the enclosure; you supply the drives. Holds up to five 3.5in SATA HDDs or SSDs (up to 100TB, 5 x 20TB) over one 10Gbps USB-C port, USB 3.1 Gen 2, backward compatible with USB 3.0/2.0.
- QUIET PWM TEMPERATURE-CONTROLLED COOLING: The 120mm fan uses intelligent PWM control, ramping up only as your drives warm — quieter during everyday use while keeping drives safe during heavy transfers.
- TRAY-LESS HOT-SWAP + DAISY-CHAIN: Tool-free drive insertion with per-bay power switch, activity LED, and a locking key plus Kensington slot. A rear USB-C port connects peripherals or daisy-chains a second dock; internal auto-switching power supply (no external brick).
- DIRECT ATTACHED STORAGE (DAS), NOT RAID AND NOT A NAS: A DAS enclosure — each drive mounts individually, JBOD-style, with no hardware RAID. It connects directly to one computer over USB-C rather than to your network. Aluminum and reinforced housing. Works with Windows, macOS, and Linux. 1-year warranty (extendable to 2 years with registration).
- Who needs access: determine whether storage is for one directly connected host or needs to be served to multiple devices over a network.
- Connection compatibility: confirm the host port or controller, enclosure interface and supported drive types all match.
- Expansion: decide whether a single external drive is enough or whether you need a multi-drive enclosure.
- Management and protection: check the host or NAS configuration, backup plan and any explicitly supported redundancy features.
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