astronomy

Ultrastar (hard disk drive)

Ultrastar (hard disk drive) is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ultrastar (hard disk drive) rather than just read about it. In short: Ultrastar is a Western Digital brand of enterprise-class high performance 3.5-inch hard disk drives (HDDs) and solid-state drives (SSDs) and formerly 10000 and 15000RPM 2.5/3.5 mission critical enterprise drives. History The brand was originally introduced by IBM in 1994 for enterprise-level HDDs together with home-computing oriented Deskstar models.

Key takeaways

Ultrastar (hard disk drive) belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ultrastar (hard disk drive) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ultrastar (hard disk drive) from memory before moving on to harder problems.

Reference excerpt

Ultrastar is a Western Digital brand of enterprise-class high performance 3.5-inch hard disk drives (HDDs) and solid-state drives (SSDs) and formerly 10000 and 15000RPM 2.5/3.5 mission critical enterprise drives.

History The brand was originally introduced by IBM in 1994 for enterprise-level HDDs together with home-computing oriented Deskstar models. These drives were based on revolutionary metalized glass disk technology. In 2003 IBM's HDD business was acquired by Hitachi, reorganized as Hitachi Global Storage Technologies (HGST) which was sold, splitting the business between Western Digital and Toshiba in 2012. The part acquired by Western Digital has retained the "HGST Ultrastar" brand name. Western Digital continued using the HGST prefix on product labels, slowly phasing it out. This resulted with some models being sold under both HGST and WD branding simultaneously (e.g. the HGST Ultrastar He10 and WD Ultrastar HC510 are the same models of HDD). These drives are typically used with enterprise computer systems. The two 1994 models, the 10.8 GB Ultrastar2 and the 8.7 GB Ultrastar2 XP, were offered with a variety of interfaces including Fast SCSI, Fast-Wide SCSI, SCA 80-pin connectors, and Serial Storage Architecture. Evaluations units were available in the third quarter of 1995. HDD models are offered with capacities up to 28 TB and with SATA or SAS interfaces. SSD models are offered with capacities up to 61.44 TB and with SATA and NVMe interface.

Illustrations

Worked examples

Example 1 — a first encounter with Ultrastar (hard disk drive)

Start with the simplest possible case. Write down what Ultrastar (hard disk drive) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ultrastar (hard disk drive) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ultrastar (hard disk drive) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ultrastar (hard disk drive)

In research: Ultrastar (hard disk drive) appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Ultrastar (hard disk drive) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Ultrastar (hard disk drive) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, Divested IBM products, Hard disk drives, so understanding it makes those chapters shorter.
In everyday life: Look for Ultrastar (hard disk drive) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ultrastar (hard disk drive) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ultrastar (hard disk drive) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ultrastar (hard disk drive) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ultrastar (hard disk drive) in simple terms?

Why does Ultrastar (hard disk drive) matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ultrastar (hard disk drive)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ultrastar (hard disk drive).