ACMT Storage & Memory 1 — Questions and Answers
Question 1: Which macOS file system is used by default on APFS volumes, and what key feature does it offer over HFS+?
- NTFS; better Windows compatibility
- APFS; space sharing between volumes in the same container and native snapshot support (Correct answer)
- ExFAT; cross-platform support
- HFS+ Extended; larger file name support
Correct answer: APFS; space sharing between volumes in the same container and native snapshot support
APFS allows multiple volumes to share the same storage container and provides built-in snapshot capabilities, both of which HFS+ lacked.
Question 2: A customer's Mac reports 'Your disk is almost full.' What is the best way to identify what is consuming the most space?
- Run Disk Utility First Aid
- Go to Apple menu > About This Mac > Storage, or use 'du' in Terminal to identify large directories (Correct answer)
- Restart the Mac
- Reset SMC
Correct answer: Go to Apple menu > About This Mac > Storage, or use 'du' in Terminal to identify large directories
The Storage pane in About This Mac provides a breakdown of storage categories, and the Terminal 'du' command allows granular inspection of folder sizes.
Question 3: On modern Apple Silicon Macs, RAM is referred to as 'Unified Memory.' What makes it different from traditional RAM?
- It is upgradeable after purchase
- It is integrated on the SoC die, shared between CPU, GPU, and Neural Engine with higher bandwidth (Correct answer)
- It uses DDR5 modules in DIMM slots
- It only stores GPU data
Correct answer: It is integrated on the SoC die, shared between CPU, GPU, and Neural Engine with higher bandwidth
Unified Memory is physically integrated onto Apple's SoC alongside the CPU, GPU, and Neural Engine, allowing all processors to access the same high-bandwidth memory pool without copying data.
Question 4: What is the consequence of attempting to upgrade RAM in an Apple Silicon MacBook?
- Performance decreases temporarily
- RAM is soldered onto the SoC and cannot be upgraded—it must be configured at purchase (Correct answer)
- It voids only the AppleCare warranty
- A firmware update is required after upgrade
Correct answer: RAM is soldered onto the SoC and cannot be upgraded—it must be configured at purchase
Apple Silicon Macs have RAM that is part of the System on a Chip (SoC) and is physically impossible to replace or upgrade after purchase.
Question 5: How should a technician verify the health of an NVMe SSD in a Mac before and after replacement?
- Check the SSD indicator light
- Use AST 2 storage tests and check SMART data via 'diskutil info' or System Information (Correct answer)
- Run Activity Monitor
- Check the storage usage in Finder
Correct answer: Use AST 2 storage tests and check SMART data via 'diskutil info' or System Information
AST 2 performs storage performance and health tests, and SMART data accessible via 'diskutil info /dev/disk0' shows raw drive health metrics.
Question 6: A customer reports extremely slow Mac performance. System Information shows 4GB of RAM and significant 'swap used.' What is the recommended solution?
- Replace the SSD with a faster model
- Add more RAM (if the Mac supports it) to reduce reliance on swap space (Correct answer)
- Reinstall macOS
- Replace the logic board
Correct answer: Add more RAM (if the Mac supports it) to reduce reliance on swap space
High swap usage means macOS is using the SSD as overflow for RAM, which is far slower; adding more RAM (on upgradeable Macs) eliminates the need for swap.
ACMT Storage & Memory 1
Which macOS file system is used by default on APFS volumes, and what key feature does it offer over HFS+?