FND-D0-O5 · 20 min
Safety, units, and the IT landscape
ESD and lifting, bits versus bytes, and a clickable map of the systems you will study.
Do not become the incident
Before Core 1 asks you to replace , Core 2 will ask you to keep yourself and the hardware alive.
Electrostatic discharge (ESD) is a tiny spark from you into a chip. You may not feel it. The board may fail later, which is worse than a clean death. Use a wrist strap clipped to the chassis (not painted metal, not the mat's banana jack only), handle cards by the edges, and park components in antistatic bags — not on a foam sofa.
Disconnect power before you go inside a or CRT-era analog territory; even modern PSUs can hold a charge. Lift with legs, not with a hero story. PPE for toner and dust is not theatrical; toner is a fine particle.
You will get a full safety domain in Core 2. The rule now: if the landscape lab PC is open, the bench must already be safe.
| Say | Means | Watch-out |
|---|---|---|
| bit (b) | 0 or 1 | Bandwidth is bits per second |
| byte (B) | 8 bits | File size is usually bytes |
| Gbps | 10^9 bits/s | 1 Gbps ≈ 125 MB/s theoretical |
| 256 GB SSD | often 256×10^9 bytes | OS may show ~238 GiB |
Storage vendors often advertise decimal GB; RAM and OS tools often count binary GiB. Bandwidth is bits per second.
Notice: Notice a 1 Gbps NIC is 1,000,000,000 bits per second, not bytes. Dividing by 8 is how you talk about file-copy speed honestly.
Table relating bit, byte, KB/KiB, MB/MiB, GB/GiB and bps versus B/s.Knowledge check 1 / 1
A NIC is rated 1 Gbps. A user asks how many megabytes per second that is, approximately, before protocol overhead.
Knowledge check 1 / 1
You are about to reseat RAM. Which setup is appropriate?
Objective checkpoint 1 / 6
Which pair is the current A+ V15 series?