IB Computer Science Topic A1.1.7 Internal and External Types of Secondary Memory Storage Revision Notes (SL/HL)

IB Computer Science Topic A1.1.7 Internal and External Types of Secondary Memory Storage Revision Notes (SL/HL) | RevisionDojo

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Internal and External Types of Secondary Memory Storage

Definition

Secondary Storage

Secondary storage is non-volatile memory used to store data permanently, even when the computer is turned off.
It holds files, applications, and the operating system for long-term use.

Internal Hard Drives

Solid State Drives (SSDs)

Definition

Solid State Drives (SSDs)

Solid State Drives (SSDs) are a type of non-volatile storage that use flash memory to store data. Unlike HDDs, SSDs have no moving parts, which makes them faster, more durable, and more energy-efficient.

Speed: SSDs offer rapid data access and transfer speeds, often exceeding 500 MB/s for SATA SSDs and up to 7,000 MB/s for NVMe SSDs.
Durability: The absence of moving parts makes SSDs more resistant to physical shock and wear.
Power Efficiency: SSDs consume less power, making them ideal for laptops and mobile devices.

Note

SSDs use NAND flash memory, which stores data in floating-gate transistors.
This technology allows data to be retained even when the power is off.

Analogy

Solid State allows direct access to data. Like grabbing a book instantly off a shelf, no rummaging needed.

Hard Disk Drives (HDDs)

Definition

Hard Disk Drives (HDDs)

Hard Disk Drives (HDDs) are traditional storage devices that use magnetic platters and a read/write head to store and retrieve data.

Capacity: HDDs offer large storage capacities at a lower cost per gigabyte compared to SSDs.
Reliability: They are reliable for long-term storage but are slower due to mechanical parts.
Use Cases: HDDs are commonly used in desktops, servers, and for bulk storage where speed is less critical.

Analogy

Magnetic Storage can only be accessed sequentially, so is slower in locating files.
Like searching a filing cabinet with drawers and labeled folders, reliable but slower.

Note

The average sustained data transfer rate for an HDD ranges from 100 MB/s to 200 MB/s, significantly slower than SSDs.

Embedded Multimedia Cards (eMMCs)

Definition

Embedded Multimedia Cards (eMMCs)

Embedded Multimedia Cards (eMMCs) are a type of flash storage integrated directly onto a device's motherboard.

Performance: eMMCs are slower than SSDs but faster than HDDs, making them suitable for budget devices.
Capacity: They typically offer lower storage capacities, ranging from 16 GB to 256 GB.

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Paywall

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Note

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Internal and External Types of Secondary Memory Storage

Definition

Secondary Storage

Secondary storage is non-volatile memory used to store data permanently, even when the computer is turned off.
It holds files, applications, and the operating system for long-term use.

Internal Hard Drives

Solid State Drives (SSDs)

Definition

Solid State Drives (SSDs)

Speed: SSDs offer rapid data access and transfer speeds, often exceeding 500 MB/s for SATA SSDs and up to 7,000 MB/s for NVMe SSDs.
Durability: The absence of moving parts makes SSDs more resistant to physical shock and wear.
Power Efficiency: SSDs consume less power, making them ideal for laptops and mobile devices.

Note

SSDs use NAND flash memory, which stores data in floating-gate transistors.
This technology allows data to be retained even when the power is off.

Analogy

Solid State allows direct access to data. Like grabbing a book instantly off a shelf, no rummaging needed.

Hard Disk Drives (HDDs)

Definition

Hard Disk Drives (HDDs)

Hard Disk Drives (HDDs) are traditional storage devices that use magnetic platters and a read/write head to store and retrieve data.

Capacity: HDDs offer large storage capacities at a lower cost per gigabyte compared to SSDs.
Reliability: They are reliable for long-term storage but are slower due to mechanical parts.
Use Cases: HDDs are commonly used in desktops, servers, and for bulk storage where speed is less critical.

Analogy

Magnetic Storage can only be accessed sequentially, so is slower in locating files.
Like searching a filing cabinet with drawers and labeled folders, reliable but slower.

Note

The average sustained data transfer rate for an HDD ranges from 100 MB/s to 200 MB/s, significantly slower than SSDs.

Embedded Multimedia Cards (eMMCs)

Definition

Embedded Multimedia Cards (eMMCs)

Embedded Multimedia Cards (eMMCs) are a type of flash storage integrated directly onto a device's motherboard.

Performance: eMMCs are slower than SSDs but faster than HDDs, making them suitable for budget devices.
Capacity: They typically offer lower storage capacities, ranging from 16 GB to 256 GB.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

IB Computer Science Topic A1.1.7: Internal and External Types of Secondary Memory Storage Notes

A1 Computer fundamentals4 subtopics

A2 Networks4 subtopics

A3 Databases4 subtopics

A4 Machine learning4 subtopics

B1 Computational thinking1 subtopic

B2 Programming5 subtopics

B3 Object-oriented programming2 subtopics

B4 Abstract data types (HL only)1 subtopic

Internal and External Types of Secondary Memory Storage

Internal Hard Drives

Solid State Drives (SSDs)

Hard Disk Drives (HDDs)

Embedded Multimedia Cards (eMMCs)

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Internal and External Types of Secondary Memory Storage

Internal Hard Drives

Solid State Drives (SSDs)

Hard Disk Drives (HDDs)

Embedded Multimedia Cards (eMMCs)

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account