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Storage Smarts Answer #10: Unit of measure

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Published: 13 Apr 2002

QUESTION OF THE WEEK:

This is a standard unit of measure for designating the height in computer enclosures and rack cabinets. It equals 1.75 inches.
a. GB
b. U
c. KB
d. J
e. bandwidth

Were you correct? This week's answer is:
b. U

Learn more:

A U is a standard unit of measure for designating the height in computer enclosures and rack cabinets. A U equals 1.75 inches. For example, a 4U chassis is 7 inches high. A 40U rack cabinet is 70 inches high.

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Dig Deeper on Primary storage devices

What hardware can I use in an Open19 rack? Open19 is a partnership that guides organizations to use open source rack servers. The organization's cages, power shelves and network switches make upgrades easy.

rack unit A rack unit (abbreviated as U, less commonly seen as RU) is a unit of measurement (1.75") applied to hardware racks and the devices that they contain.

rack A rack, in an IT (information technology) context, is a supporting framework that holds hardware modules. In this context, racks typically contain servers, hard disk drives and other computing equipment.

3.5" SSD (3.5 solid-state drive) A 3.5 solid-state drive (SSD) is a data storage device designed for the 3.5-inch hard disk drive (HDD) form factor. It fits into the drive slot as a same-sized HDD in a portable computer, enterprise server, or storage system.

HDD form factor (hard disk drive form factor) HDD form factor is the size or geometry of a hard disk drive, determining the device’s compatibility with the drive bays in a storage array or enclosure, server, portable computer or other computing device.

Avoid common server racking issues Increasing physical demands of modern IT gear can pose problems for classic rack enclosures. Watch for these factors when buying new racks or equipment.

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Storage Smarts Answer #10: Unit of measure

Think you know storage? Take our quiz and test your storage smarts.

Dig Deeper on Primary storage devices

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SearchDisasterRecovery

Zerto plays big role in McKesson's disaster recovery plan

Why you should have a disaster recovery testing plan in place

Post-disaster recovery, don't overlook user connectivity

SearchDataBackup

Create an effective data backup strategy from scratch

Druva expands on AWS backup, moves S3 snaps across regions

SaaS backup services deliver data protection for SaaS apps

SearchConvergedInfrastructure

HCI storage adoption rises as array sales slip

Microsoft Storage Spaces Direct simplifies converged, HCI storage

Explore compelling benefits of hyper-converged infrastructure

Dig Deeper on Primary storage devices

Start the conversation

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