Comparison · Updated November 2026

Logical vs. Physical vs. Full File System Extraction in 2026

A 2026 plain-English comparison of the three main mobile forensic acquisition types: what each gets, what it misses, and which is realistic on modern iPhone and Android devices.

Last updated: November 15, 2026 · Reviewed by Elite Digital Forensics examiners

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TL;DR. Logical extraction copies user-visible data (messages, photos, contacts, call logs) via the OS interface. Full file system (advanced logical) extraction reaches sandboxed app data, system databases, and many caches. Physical extraction traditionally meant a bit-for-bit copy of the underlying flash storage; on modern hardware-encrypted iPhones and Android flagships in 2026, true physical extraction is largely impractical and rarely produces decrypted content without the credential.

At a glance

	Logical	Full File System (Advanced Logical)	Physical (bit-for-bit)
What it captures	User-visible artifacts: SMS/iMessage, photos, contacts, call logs, basic app data	Sandboxed app databases, system caches, deleted artifacts in unallocated within databases (WAL/journal), iOS KnowledgeC, biome, Android system DBs	Raw flash contents, including allocated and unallocated blocks
Requires unlock?	Yes (AFU)	Yes (AFU); on iOS, requires specialized pathway	Sometimes; generally yes on modern devices
Modern iPhone (13+ / iOS 17–26)	Standard, supported	Possible via specialized pathway, capability degrades each iOS release	Generally not possible (hardware-bound encryption + key destruction)
Modern Android flagship (Android 16, Pixel 9 / Galaxy S25)	Standard with unlock	Possible on some configurations; vendor-dependent	Generally not possible without bootloader unlock (which wipes data)
Old / unsupported devices	Standard	Often available	Often available (e.g., checkm8 on A11 and earlier iPhones)
Recovers deleted data?	Limited (Recently Deleted folder, app trash)	Yes, within SQLite free-list / WAL / journal lifetime	Yes if blocks not encrypted-and-keys-destroyed

Why physical extraction matters less than it used to

On iPhone 13 and newer, every file is encrypted with a per-file key wrapped by class keys held in the Secure Enclave. When a file is deleted, the per-file key is destroyed. Even a perfect bit-for-bit copy of the NAND therefore contains encrypted-and-now-undecryptable blocks instead of recoverable plaintext. Android 16 with File-Based Encryption behaves similarly: Credential-Encrypted storage is unreadable without the user’s credential, and per-file keys are destroyed at delete time. Modern physical extraction, when achievable, is therefore more useful for system metadata than for traditional “deleted file carving.”

What full file system extraction adds over logical

App sandboxes (private databases for messaging apps, including some E2E messengers when AFU)
SQLite WAL (write-ahead log) and journal files that frequently contain records deleted from the visible database
iOS KnowledgeC, biome, and PowerLog databases (rich device-usage timeline)
Android system DBs (notifications, accessibility, system services)
Tokens and configuration files that establish account linkage
Caches and snapshots that sometimes contain previewable content of disappearing messages

When each extraction type is the right tool

Logical is the default for unlocked devices in routine civil and consumer matters: family-law, infidelity, business-device misuse. It produces a clean, hash-verified package of user-visible content quickly.

Full file system is the right choice when:

The matter turns on app-internal artifacts (messaging app receipts, location databases, system usage timelines)
Deleted artifacts may live in WAL / journal files
Cross-app correlation is needed
The matter is contested and a complete artifact set is needed for rebuttal

Physical is mostly relevant for older devices, BFU image preservation, and damaged or chip-off scenarios. On modern flagships it is rarely the right ask in 2026.

What this means for case planning

Move fast. The longer a modern iPhone sits idle, the more likely it reboots into BFU (iOS 18 inactivity reboot ~72 hours) and the harder the acquisition becomes.
Get the credential up front. With consent or a lawful unlock, full file system extraction is realistic on most modern devices. Without it, you may be limited to BFU artifacts.
Preserve cloud backups. iCloud Backups, Google Account backups, and chat-app cloud backups often contain the deleted content that the device itself no longer has.
Do not bootloader-unlock or factory-reset an Android device you are about to send for examination.

How Elite Digital Forensics scopes acquisition type

On every intake call we explain what the realistic acquisition type is for your specific device, OS version, lock state, and credential availability, and what each type will and will not recover. We do not promise “physical extraction” on a modern locked flagship; on the rare matters where it is appropriate, we say so in writing.

Want a fixed-fee quote for your matter?

Tell us about your device, account, or incident. We will tell you what is recoverable, what isn’t, and what it will cost, in a free 20-minute consultation.

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Primary Sources

Apple Platform Security Guide – iOS Data Protection (2025). support.apple.com
Android Open Source Project – File-Based Encryption. source.android.com
NIST SP 800-101 Rev. 1 – Guidelines on Mobile Device Forensics. csrc.nist.gov
DFIR Review – Alternate Locations for Deleted iMessage / SMS Data (2022).

This page is published for general educational purposes by Elite Digital Forensics. It is not legal advice and does not create an attorney-client or examiner-client relationship. Facts and platform behaviors can change; always confirm with a qualified examiner or attorney before relying on any specific statement for a real case.