Question

Choose at least three devices and list the following information about
each of them:
Method (optical, magnetic or solid state?)
Capacity (how much can it store?)
Speed
Portability
Durability and Reliability

List of devices:
CD
DVD
Blu-ray Disc
Floppy Disk
Internal Hard Disk
External Hard Disk
Flash drive (USB stick or memory card)
Solid State Drive (Internal)

Answer 1

Here's a breakdown of the devices you mentioned, covering their method, capacity, speed, portability, and durability and reliability:

### 1. CD (Compact Disc)
- **Method**: Optical
- **Capacity**: 700 MB (standard CD)
- **Speed**: Generally 150 KB/s (up to 1.2 MB/s with high-speed drives)
- **Portability**: Highly portable, lightweight, and easy to carry
- **Durability and Reliability**: Susceptible to scratches and environmental factors; relatively reliable if stored properly compared to magnetic storage.

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### 2. DVD (Digital Versatile Disc)
- **Method**: Optical
- **Capacity**: 4.7 GB (single-layer), 8.5 GB (dual-layer)
- **Speed**: Up to 11 MB/s (varies depending on the format and drive)
- **Portability**: Highly portable and similar in size to CDs
- **Durability and Reliability**: More durable than CDs in terms of data integrity, but still vulnerable to scratches and physical damage.

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### 3. Blu-ray Disc
- **Method**: Optical
- **Capacity**: 25 GB (single-layer), 50 GB (dual-layer)
- **Speed**: Up to 36 MB/s (standard Blu-ray)
- **Portability**: Highly portable, similar in size to CDs and DVDs
- **Durability and Reliability**: Improved durability due to a protective coating; still somewhat vulnerable to scratches, but better storage life compared to CDs and DVDs.

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### 4. Floppy Disk
- **Method**: Magnetic
- **Capacity**: 1.44 MB (3.5" floppy)
- **Speed**: Approximately 500 KB/s
- **Portability**: Portable, but larger and less durable than modern options
- **Durability and Reliability**: Prone to magnetic interference, environmental damage, and wear over time; generally considered less reliable.

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### 5. Internal Hard Disk (HDD)
- **Method**: Magnetic
- **Capacity**: Ranges from hundreds of GB to several TB (1 TB = 1000 GB)
- **Speed**: 80-160 MB/s (varies based on RPM and technology)
- **Portability**: Not portable unless it's removed and placed in an external enclosure
- **Durability and Reliability**: Mechanical components make it prone to failure; reliability improves with proper usage and care.

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### 6. External Hard Disk
- **Method**: Magnetic
- **Capacity**: Ranges from hundreds of GB to several TB
- **Speed**: 80-160 MB/s (USB 3.0 or higher)
- **Portability**: Highly portable, designed for ease of transport
- **Durability and Reliability**: Similar to internal HDDs; more susceptible to physical shocks due to movement while connected.

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### 7. Flash Drive (USB Stick or Memory Card)
- **Method**: Solid State
- **Capacity**: Ranges from a few GB to several TB
- **Speed**: 5-400 MB/s (varies based on USB version and type of flash memory)
- **Portability**: Extremely portable; small and lightweight
- **Durability and Reliability**: Generally very durable; resistant to physical shocks and environmental conditions when compared to HDDs.

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### 8. Solid State Drive (Internal SSD)
- **Method**: Solid State
- **Capacity**: Ranges from 120 GB to several TB
- **Speed**: 200-5000 MB/s (depends on PCIe and NVMe technology)
- **Portability**: Not portable unless removed; smaller form factor than HDD
- **Durability and Reliability**: More reliable than HDDs due to no moving parts; lower risk of mechanical failure and generally better lifespan.

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This comparison covers a range of storage technologies, highlighting their differences in various aspects.