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A+ Core 2 · CompTIA 220-1202 V15 · Objective C2-1.1

Explain common operating system (OS) types and their purposes

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Objective 1.1: Explain common operating system (OS) types and their purposes

Cert: CompTIA A+ Core 2 (220-1202) V15 Domain: 1.0 Operating Systems Weight: ~28% of Core 2 (this objective is the entry point to the domain) Depth: Explain. The candidate must identify common OSs, their use cases, the filesystems they support, vendor life-cycle considerations, and cross-OS compatibility concerns.

What this objective tests

You should be able to identify what each common operating system is built for, which devices typically run it, which filesystems it uses, and when vendor support is going away. You should also be able to predict what breaks when files, apps, or accounts move between operating systems.

This is the foundational lesson for the whole 1.0 domain. Everything in 1.2 through 1.11 assumes you know the difference between Windows, macOS, Linux, Chrome OS, iOS, iPadOS, and Android, and that you understand which filesystem each one prefers.

Key facts

Windows:

  • Microsoft's workstation OS. Dominant in business and home desktops.
  • Two main consumer lines tested on V15: Windows 10 and Windows 11.
  • Default filesystem is NTFS for the system drive. Supports FAT32 and exFAT on removable media. ReFS is available for specific server and storage workloads.
  • Strong backward compatibility with legacy software, deep Active Directory integration, broad hardware driver support.

Linux:

  • Open-source kernel with many distributions (Ubuntu, Fedora, Debian, Red Hat Enterprise Linux, SUSE, Arch).
  • Dominates servers, embedded systems, and developer workstations. Smaller share of consumer desktops.
  • Default filesystem on most distributions is ext4. XFS is common on enterprise distributions and large storage workloads.
  • Free, customizable, transparent. Steeper learning curve for non-technical users.

macOS:

  • Apple's workstation OS. Runs exclusively on Apple hardware (Mac, MacBook).
  • Default filesystem is APFS (Apple File System), introduced in 2017 replacing HFS+.
  • Unix-based foundation underneath a polished GUI. Common in creative industries, education, and software development.

Chrome OS:

  • Google's workstation OS. Runs on Chromebooks.
  • Lightweight, cloud-first. Most apps run in the browser or as Android apps.
  • Common in K-12 education because of low device cost and central management via Google Workspace.
  • Local storage is limited; users are expected to keep files in Google Drive.

iOS:

  • Apple's mobile OS for iPhone.
  • Closed ecosystem with apps distributed only through the App Store.
  • Tight hardware-software integration, strong security defaults, frequent updates pushed by Apple directly to devices.

iPadOS:

  • Apple's iPad OS, forked from iOS in 2019 to add multitasking, file management, and external display features iPad needed beyond what iOS provided.
  • Shares the App Store with iOS. Supports more desktop-class workflows than iOS.

Android:

  • Google's mobile OS. Open-source core (AOSP) with vendor customizations from Samsung, Google Pixel, Motorola, and others.
  • Apps distributed through Google Play Store on most devices; alternative app stores (Amazon, F-Droid) exist.
  • Updates flow from Google through device vendors, which is why update timing varies wildly across Android devices.

NTFS (New Technology File System):

  • Windows default filesystem since Windows NT.
  • Supports large files (up to 16 EB theoretical), file-level permissions (NTFS ACLs), encryption (EFS), compression, journaling for crash recovery.
  • Required for Windows system drives.

ReFS (Resilient File System):

  • Newer Microsoft filesystem designed for high reliability and large-scale storage (Windows Server, some Windows 11 Pro for Workstations scenarios).
  • Self-healing, supports very large volumes and files, integrity streams for data corruption detection.
  • Not used as a Windows boot drive. Specialized rather than general-purpose.

FAT32 (File Allocation Table 32):

  • Old, simple, universally compatible filesystem.
  • Maximum file size 4 GB. Maximum volume size 32 GB on most format tools (technically supports larger).
  • Used on USB flash drives and SD cards because nearly every OS reads and writes it.
  • No permissions, no journaling. Don't use for Windows system drives.

exFAT (Extensible File Allocation Table):

  • Microsoft's modern replacement for FAT32 on removable media.
  • No 4 GB file size limit, supports very large volumes.
  • Readable by Windows, macOS, Linux, modern cameras, game consoles.
  • Default choice for large external drives shared across operating systems.

ext4 (Fourth extended filesystem):

  • Default Linux filesystem since around 2008.
  • Journaling, supports very large files and volumes, mature and well-tested.
  • Linux-native; Windows does not read ext4 without third-party tools.

XFS (Extended filesystem, but originally from SGI):

  • High-performance Linux filesystem designed for very large files and parallel I/O.
  • Default on Red Hat Enterprise Linux and CentOS Stream.
  • Strong for media servers, databases, and big-storage workloads.

APFS (Apple File System):

  • macOS, iOS, iPadOS default filesystem since 2017.
  • Optimized for SSDs, supports snapshots, cloning, native encryption.
  • Replaced HFS+ which had been the Mac filesystem since 1998.

End-of-life (EOL):

  • The date after which a vendor stops releasing security patches and bug fixes for an OS version.
  • Continuing to run an EOL OS is a security risk because newly discovered vulnerabilities never get patched.
  • Examples: Windows 7 EOL January 2020, Windows 8.1 EOL January 2023, Windows 10 EOL October 2025 (per Microsoft).

Update limitations:

  • Some hardware can't upgrade past a certain OS version because of CPU, TPM, or driver requirements.
  • Windows 11 requires TPM 2.0, UEFI Secure Boot, and a supported CPU. Older PCs that ran Windows 10 fine can't move to Windows 11.
  • Android phones often get only 2-3 years of major OS upgrades from the device vendor, even if Google still supports the platform.
  • iPhones get longer support windows (typically 5-7 years), tied to Apple controlling both hardware and software.

Compatibility concerns between OSs:

  • File formats: most modern formats (PDF, DOCX, JPG, MP4, ZIP) work across OSs. Older proprietary formats (older Office, Pages, Numbers) may need conversion.
  • Application binaries don't cross OSs without virtualization, emulation, or compatibility layers (Wine on Linux, Rosetta on Apple Silicon for x86 macOS apps).
  • Filesystems: NTFS read-only on macOS by default. ext4 not readable on Windows without tools. APFS not readable on Windows or Linux without tools.
  • exFAT is the practical universal filesystem for cross-OS USB drives.
  • Cloud storage (OneDrive, Google Drive, iCloud, Dropbox) sidesteps most of these issues by syncing through a cross-platform service.

Common gotchas

  • EOL OSs still on production machines. Customers often run Windows 7 or Windows 8.1 well past EOL because "it still works." It works until the next ransomware campaign targets an unpatched vulnerability. Plan migrations before EOL hits.
  • NTFS removable drives unreadable on Mac. A customer formats a 2 TB external drive as NTFS on Windows, then plugs it into a Mac to share files. macOS reads it but won't write. Reformat as exFAT for true cross-platform.
  • FAT32 4 GB file size limit. Trying to copy a 6 GB video file to a FAT32 USB drive fails with "file too large." exFAT or NTFS for files over 4 GB.
  • Windows 11 hardware requirements. Quoting a Windows 11 upgrade for a 2018-era PC that lacks TPM 2.0 or has an unsupported CPU. Check requirements before promising.
  • Android version fragmentation. Asking "are you on Android 13 or 14?" matters because feature availability and security patches differ wildly across vendors and device ages.
  • Chrome OS local storage assumptions. A teacher hands a student a Chromebook and assumes they can save large video files locally. Chromebooks are designed around cloud storage; local storage is small.

Real-world context

For an MSP or helpdesk, OS identification drives nearly every other decision:

  • "User reports their laptop is slow." First question: which OS, which version. A Windows 10 issue and a Windows 11 issue have different diagnostic paths.
  • "We need to migrate the office to new computers." OS decision shapes the rest. Windows 11 means TPM 2.0 minimum, which means some older peripherals (some printers, some specialty hardware) may not have current drivers. macOS means re-buying Mac-native software licenses.
  • "Customer wants a cheap laptop for their kid's schoolwork." Chromebook is often the right answer if the school uses Google Workspace. Windows if the school requires specific Windows-only software.
  • "We need to share files between Windows desktop and a few Macs in the office." exFAT external drive works, or set up a NAS that exposes SMB shares which both OSs handle natively, or use a cloud sync service.

OS life-cycle planning is part of any IT operations cadence. Track which devices are running what, and watch upcoming EOL dates so migrations are budgeted ahead of forced upgrades.

Sources

  • [CompTIA A+ 220-1202 Exam Objectives Version 4.0, Section 1.1](../../../../../../30-RevyTechJourney/CompTIA%20A%2B%20220-1202%20Exam%20Objectives%20%284.0%29.pdf)
  • [Microsoft: Windows 10 lifecycle](https://learn.microsoft.com/en-us/lifecycle/products/windows-10-home-and-pro)
  • [Microsoft: Windows 11 system requirements](https://www.microsoft.com/en-us/windows/windows-11-specifications)
  • [Apple: APFS overview](https://support.apple.com/guide/disk-utility/file-system-formats-dsku19ed921c/mac)
  • [Wikipedia: NTFS](https://en.wikipedia.org/wiki/NTFS)
  • [Wikipedia: exFAT](https://en.wikipedia.org/wiki/ExFAT)
  • [Wikipedia: ext4](https://en.wikipedia.org/wiki/Ext4)
  • [Wikipedia: APFS](https://en.wikipedia.org/wiki/Apple_File_System)
  • [Wikipedia: Chrome OS](https://en.wikipedia.org/wiki/ChromeOS)