Automatically translated.View original post

How to Format C Drive | Help to Reinstall and Repair Windows

C drive format cannot be done by normal operation.

In this video, we will explain why and two ways to do it correctly!

Useful knowledge for Windows reinstallation and system repair.

With Partition Assistant, anyone can safely format the C drive.

# C drive # Format # windows Computer Repair # reinstall OS

2025/8/21 Edited to

... Read moreCドライブのフォーマットを調べている人って、「Windowsが起動しない/動作が重いから初期化したい」「再インストール前にまっさらにしたい」みたいな状況が多いと思います。私も最初はエクスプローラーでCドライブを右クリックしてフォーマットしようとして、"このボリュームをフォーマットできません"系の警告が出て詰みました。結論、Windows起動中のCドライブは“使っている最中”なので削除やフォーマットができません。 私が事前に必ずやるチェックは3つです。①バックアップ:フォーマットすると全データ消去なので、ドキュメント/デスクトップだけじゃなく、ブラウザのブックマークやパスワード、ゲームのセーブ、ライセンス情報も退避。②BitLocker:有効なら回復キーの控えを用意。③再インストール方法の確認:メーカーPCならリカバリー領域を使うのか、WindowsのインストールUSBでクリーンインストールするのかを決めます。 コマンドプロンプトでformatする流れは、「インストールメディアまたは修復ディスクで起動→詳細オプション→コマンドプロンプト」です。ここで注意なのが“ドライブ文字が変わる”こと。起動環境ではWindowsが入ってる場所がC:じゃない場合があるので、diskpart→list volumeで確認してから実行するのが安全です。たとえばNTFSで消したいなら format x: /fs:ntfs のように指定します(xは確認したドライブ文字)。 「リカバリーディスク作成」も合わせて準備しておくと安心でした。Windowsの回復ドライブ(USB)を作っておけば、起動トラブル時に修復や初期化に進めます。 また、ディスクがRAWになっている/"このボリュームは認識可能なファイルシステムではありません"と出るケースは、いきなりフォーマットより先に原因切り分けがおすすめです。物理故障の可能性もあるので、S.M.A.R.T.(回復不可能セクタ数など)を確認し、異常が多いならSSD/HDD交換→再インストールの方が結果的に早いです。 「ディスク領域不足」「十分な空き容量がありません(あるのに)」系でCドライブ容量を減らしたい/空けたい場合は、まず不要アプリ削除、Windows Updateの一時ファイル削除、システムの復元ポイント整理、ページファイル/休止ファイル調整などで改善することもあります。フォーマットは最終手段にすると失敗が減りました。 最後に、USBメモリを廃棄する前のデータ消去も同じ発想で、単なる削除では残ることがあります。機密データなら“上書き消去”や暗号化後の初期化も検討すると安心です。

Related posts

⚠️ C Drive Turned RAW? Fix it and Recover Data
Is your C drive suddenly showing as RAW and Windows won’t boot properly? This usually means the file system is corrupted or unreadable. This video explains how to recover files from a RAW system drive, access the disk safely using recovery tools or bootable media, and repair the drive without makin
XanthusTechCore

XanthusTechCore

0 likes

How to Clone Your C: Drive|Move Your OS & Data As-
Want to move your C: drive to a new SSD without reinstalling Windows and your apps from scratch? Disk cloning lets you transfer your OS, applications, settings, and data together. In this video, we'll show you how to clone your C: drive with AOMEI Cloner. #PCClone #CDrive #DiskClone #S
tech_buggie

tech_buggie

0 likes

The image shows a hard drive with a Windows logo, a recycling bin with files, and a laptop, illustrating the recovery of deleted files from a C Drive in Windows 10 & 11. It highlights effective solutions for accidentally deleted files.
This image outlines two file recovery methods: using Windows File History to restore previous versions and using Windows File Recovery via Command Prompt, with an example command for recovering files.
The image details two more file recovery methods: using the CHKDSK tool in Command Prompt and using professional software like MyRecover. It also includes a bonus tip for recovering files when the computer won't boot.
🖥️ Deleted Files from Your C Drive on Windows? Recover Them Fast!
Accidentally deleted files from the C drive on Windows? This video shows effective ways to recover lost documents, photos, and system files before they’re permanently overwritten. #datarecovery #windowstips #windows11 #systemofadown #techtips
XanthusTechCore

XanthusTechCore

1 like

The image shows a computer monitor with a '404' error, symbolizing a full C drive causing PC freezes and warnings. Text asks if the C drive turned red and advises against deleting important files, promising foolproof methods to clean hidden junk.
This image presents two solutions for freeing up C drive space: Disk Cleanup, with a screenshot showing options to delete temporary files and old Windows installations, and Manually Delete Temp Files, instructing users to remove files from the %temp% folder.
The image outlines two more solutions: Solution 3, Disable Hibernation, showing a command prompt executing 'powercfg.exe /hibernate off' to delete hiberfil.sys. Solution 4, Files On-Demand (OneDrive), suggests enabling cloud storage to save local space.
FIX: C-Drive is RED! How to Free Up Space in pc
Is Windows 11 warning you that your C-Drive is full, but you have no idea why? Don't start deleting your personal documents just yet—it's better to clean out the system's hidden junk first. In this video, I’ll show you 4 rapid methods to clear space and the ultimate permanent fix: migr
Information Lab

Information Lab

0 likes

How to Extend C Drive from D Drive in Windows 11
This video is the full guide on how to extend C drive from D drive in Windows 11/10/8/7. Follow it to get a larger C drive now! #extend #drive #increase
tech_buggie

tech_buggie

0 likes

Solved: My C Drive Is Full Without Reason Windows
Sometimes, your C drive may suddenly appear full for no obvious reason. In this guide, you’ll learn the common causes behind this problem and discover several proven ways to fix it on Windows 11, 10, 8, and 7. #cdrive #full #SLOW #windows #extend
tech_buggie

tech_buggie

1 like

How to Extend C Drive in Windows 10/11 Without Los
Need to extend C drive but the “Extend Volume” option is greyed out? This step-by-step guide will help you expand your system partition and free up space without reinstalling Windows. #ExtendCDrive #Windows10 #Windows11 #DiskManagement #CDriveFull #PartitionManager #TechTutorial #PC
techsheldon

techsheldon

1 like

Backup C Drive on Windows 10/11 [Fast & Easy]
Need a full system backup on Windows 10/11? Here's an easy way to back up your C drive without confusion. No tech skills required. Watch this before it’s too late. #backup #cdrive #system #windows
SmoothTechie

SmoothTechie

7 likes

📌Delected Your Downloads on Windows? Here's How to
Accidently deleted everything your downloads folder on your Windows PC? Don't panic! This video shows 4 proven ways to recover deleteddeleted downloads that can find lost docs installers, photos, videos and more before they gone forever. Act fast! #windows11 #cybersecurity #asklemon
XanthusTechCore

XanthusTechCore

1 like

If your C drive is full, this video gives a clear overview of how you can free up space and restore normal Windows performance. Learn the key methods used to clean system storage, manage large files, and make your C drive run smoothly again without slowing down your PC. #CDriveFull #WindowsFi
techsheldon

techsheldon

1 like

Need to resize C drive in Windows Server 2019 but the built-in Disk Management doesn’t let you extend it? This tutorial walks you through safe and effective ways to increase or shrink your system partition. #WindowsServer2019 #ResizeCDrive #ExtendCDrive #ServerPartition #DiskManagemen
techsheldon

techsheldon

1 like

How to Increase C Drive Space in Windows 10
How to increase C drive space in Windows 10? In this video, you will learn three easy and reliable methods to extend the C drive with ease. #extend #cdrive #space #windows #resize
tech_buggie

tech_buggie

0 likes

C Drive Not Enough!Capacity!How to add unallcated
Running out of space on your C drive? Have unallocated space but cannot add it? Windows Disk Management has limitations when extending partitions. Partition Assistant makes it easier to resize and move partitions, helping you add unallocated space to your C drive. #PartitionManager #CDriveFu
tech_buggie

tech_buggie

2 likes

How to Extend C Drive Space in Windows
It’s necessary to enlarge the C drive to speed up the PC performance. This video covers three easy ways to tell you how to extend C drive space in Windows 10. #extend #cdrive #space #resize #windows
techease_zone

techease_zone

2 likes

PC Suddenly Slow? Fix it Right Now!
Is your PC suddenly slow? Extending C drive is a good way to fix it. Follow this quick guide to know how to boost your your computer’s speed and performance. #PC #SLOW #windows #performance #speed
techease_zone

techease_zone

1 like

How to Unformat a Hard Drive and Recover All Data
Watch how to unformat your hard drive and recover all your documents, photos, and videos easily. Download AOMEI FastRecovery and get your files back today. 👉 Giveaway license code: code.aomeitech.com 👉 Discount code: Special30OFF #format #hdd #ssd #recovery #data
RedFFTech

RedFFTech

1 like

This image illustrates the risk of external drive failure due to physical damage, viruses, or wear. It emphasizes that data loss is permanent if not backed up, urging users to back up their external hard drive to another one to protect their digital life.
This image explains why Windows' built-in 'Backup and Restore' is insufficient for external drives, as it only backs up from the PC and doesn't allow external drives as sources. It highlights that manual copying is slow and cannot be scheduled, posing a problem for automatic backups.
This image presents a solution for backing up external drives. It shows steps to connect two external drives, open backup software, select the current drive as the source and a new drive as the destination, then start the backup process, indicating it's a simple, three-click operation.
External Drive Failure is Inevitable: How to Clone
Every external drive has an expiration date. 📉 If your entire digital life is sitting on a single piece of hardware, you’re essentially playing with fire. In this guide, I’m showing you the automated path to mirroring your external storage using AOMEI Backupper. We’re bypassing the slow, manual Win
Information Lab

Information Lab

2 likes

Solve Windows C Drive Full D Drive Empty Issue
Windows C drive full D drive empty? Don’t worry, this guide covers full steps to help you transfer the free space from D drive to C drive or move apps from C drive to D drive. #drive #empty #full
techease_zone

techease_zone

0 likes

How to Fix My C Drive Is Full Without Reason
Why is my C drive is full without reason? Here we’ll explain the issue and provides several practical solutions to free up space in Windows 11, 10, 8, and 7. #cdrive #full #windows #disk #extend
techease_zone

techease_zone

1 like

A command prompt window displays an error message, "REAGENTC.EXE: The Windows RE image was not found," indicating a problem with enabling the Windows Recovery Environment.
A file explorer window shows the contents of a mounted ISO file, highlighting the 'sources' folder, illustrating a step in manually restoring the WinRE image.
A screenshot of Disk Management shows options for creating new volumes, accompanying instructions on how to rebuild a recovery partition by shrinking a drive and creating a new simple volume.
reagentc /enable Not Working? Here are quick fixes
Meet reagentc enable not working? Windows recovery wouldn’t turn on? Here is how to troubleshoot it and an alternative recovery solution - simple and effective. #reagentc #WindowsRecovery #SystemRepair #AOMEIBackupper #BackupTool #Shorts
RealUserTech

RealUserTech

0 likes

How I Erased My C Drive Safely Before Reselling
Here is how I erase my C drive completely, before reselling it. Simple to use and perfect for data privacy. #EraseCDrive #AOMEIBackupper #PCMaintenance #DataWipe #WindowsTips
techview55hub

techview55hub

1 like

How to Move Windows Recovery Partition Safely
Running out of disk space. Want to extend your C drive but the recovery partition is stuck in the wrong location? This video will teach you how to safely move it without deleting system files. #partition #move #Windows #disk #pctips
SmoothTechie

SmoothTechie

1 like

How to Upgrade C Drive Storage Without Losing Data
Learn how to upgrade C drive storage - no reinstall, no data loss, just a faster PC! #HowToUpgradeCDriveStorage #AOMEICloner #CDriveUpgrade #SSDClone #Windows11 #Windows10 #DataMigration #DiskClone
RealUserTech

RealUserTech

2 likes

Clone C Drive to D Drive Without OS Reinstalling
How to clone C drive to D drive and with no need to reinstall Windows. I use the cloning software here, and the whole process was smooth and fast. Booted up with zero issues. #CloneCDrive #DiskCloning #WindowsTips #AOMEICloner #PCUpgrade
RealUserTech

RealUserTech

0 likes

How to Recover Data from an External Hard Drive
Lost files on your external hard drive? Don't panic. Learn how to use Windows tools and an easier way to recover your data in just a few steps. #ExternalHardDrive #DataRecovery #RecoverFiles #WindowsTips #TechTips
tech_buggie

tech_buggie

0 likes

Want to Increase C Drive Space? Get the Best Way!
How to increase C drive space in Windows 11/10/8/7? With Partition Assistant, you can easily and safely extend your C drive space without losing any data. #increase #cdrive #disk #space #windows
tech_buggie

tech_buggie

0 likes

🚨Recover Permanently Deleted Files on Windows 10
Deleted files bypassed the Recycle Bin? Don’t panic. This video covers 5 effective ways to recover permanently deleted files on Windows 10 using backups, CMD tools, File History, Windows File Recovery, and professional recovery software before the data gets overwritten. #windows10 #techsupport
XanthusTechCore

XanthusTechCore

1 like

3 Ways to Extend C Drive in Windows 10/11 Easily
When your C drive is nearly full and PC gets slow, you can extend C drive Windows 10 or 11 using Disk Management, DiskPart, or a professional third-party partition manager. #extend #resize #cdrive #windows #space
Techcrafter

Techcrafter

0 likes

How to Extend C Drive in Windows 10/11 Without Losing Data | Step-by-Step Guide Need to extend C drive but the “Extend Volume” option is greyed out? This step-by-step guide will help you expand your system partition and free up space without reinstalling Windows. #ExtendCDrive #Windows10 #W
tech hu

tech hu

1 like

Why My PC Suddenly Slow and How to Fix it?
Low space on C drive may cause your PC suddenly slow. Don’t worry, this post will teach you how to solve this problem and offers a powerful tool to make your computer run faster. #PC #SLOW #windows #space
tech_buggie

tech_buggie

0 likes

Need to resize C drive in Windows Server 2019 but the built-in Disk Management doesn’t let you extend it? This tutorial walks you through safe and effective ways to increase or shrink your system partition. #WindowsServer2019 #ResizeCDrive #ExtendCDrive #ServerPartition #DiskManagemen
tech hu

tech hu

1 like

Quick Formatted Your Drive? Recover in 3 Steps
Mistakenly quick formatted your hard drive? Get your files back with AOMEI FastRecovery in 3 steps! 📂 No backup needed! #DataRecovery #AOMEIFastRecovery #quickformat #filerecovery
techview55hub

techview55hub

0 likes

Replace Hard Drive and Reinstall Windows 11/10
Want a fresh start with a new drive? Here's how to replace your main hard drive and reinstall Windows 11/10. Don't want to start from scratch? You can clone your system straight to the new drive instead. #hdd #disk #clone #windows10 #windows11
RedFFTech

RedFFTech

0 likes

How to Increase C Drive Space in Windows 10 [2025]
Watch this video to learn how to increase C drive space in Windows 10. No need to delete files or reinstall — just follow these simple steps! 👉Get your giveaway license code: code.aomeitech.com 👉Use discount code Special30OFF for extra savings!  #cdrive #increase #disk #windows #pctips
TechEase

TechEase

0 likes

Recover Data from Formatted C Drive (Window10/11)
Accidentally formatted C drive? Yep, you can still get files back. #TechTips #Lemon8Diary #foryoupage #work
Moon Bureau

Moon Bureau

0 likes

Looking for a powerful partition manager to take control of your disks? Whether you want to extend your C drive, format a USB, clone a hard drive, or convert MBR to GPT, this guide covers the best tools and methods. #PartitionManager #DiskManagement #Windows10 #Windows11 #ResizePartit
tech hu

tech hu

2 likes

If your computer won’t boot and you suspect MBR corruption, this tutorial will show you how to fix MBR using Windows built-in tools and professional partition repair utilities. #FixMBR #MBRRepair #BootError #Windows10 #Windows11 #DiskRepair #BootRec #PartitionAssistant #TechTutorial
tech hu

tech hu

0 likes

🛠️ Windows 10 Won’t Boot? Try These Repair Methods
PC stuck on startup or boot loop? This video covers the best Windows 10 boot repair tools to fix startup errors, corrupted boot files, and system crashes without reinstalling Windows. #windows10 #bootloop #techsupport #tutorial #windowstips
XanthusTechCore

XanthusTechCore

3 likes

How to Increase C Drive Space from D Drive
How to increase C drive space from D drive to solve low disk problem in Windows 11, 10, 8, and 7? Here are full steps you can try to extend C drive by taking space from D drive. #increase #drive #space #windows
Techcrafter

Techcrafter

0 likes

Diskpart: How to Format a USB Drive Using CMD
Want to format your USB but get "Windows couldn't complete the format"? You can use Diskpart to do it. If you want an easier, restriction-free solution, try Partition Assistant. #USB #flashdrive #format #diskpart #cmd
SmoothTechie

SmoothTechie

0 likes

Looking to format a drive to exFAT using DiskPart? This step-by-step guide will teach you how to use Windows’ built-in command-line tool to prepare your drive for large files and cross-platform use. #DiskPart #FormatexFAT #Windows10 #Windows11 #USBFormat #CommandPrompt #DiskManageme
techsheldon

techsheldon

1 like

C Drive Full? Move Your Programs on Windows 11
Is your C drive packed, making Windows 11 slow or glitchy? You don't have to reinstall everything! I'll show you how to move your programs to another drive and get your space back – quick and easy. #disk #program #windows11 #move #storage
SmoothTechie

SmoothTechie

0 likes

C Drive Keeps Filling Up? Try These Fixes
PC stuck at startup? Use Partition Assistant to repair boot problems easily. No technical skills needed, just a few clicks and your computer will be ready to go! #pctips #boot #startup #repair
SmoothTechie

SmoothTechie

0 likes

External Hard Drive Corrupted? Try CHKDSK!
Disk errors, unreadable files, or an unrecognized external drive? Learn how to repair your external hard drive with CHKDSK and a simpler way to manage your drive. #externalharddrive #repair #chkdsk #errors #pctips
Tech SOS Hub

Tech SOS Hub

0 likes

If your C drive is full, this video gives a clear overview of how you can free up space and restore normal Windows performance. Learn the key methods used to clean system storage, manage large files, and make your C drive run smoothly again without slowing down your PC. #CDriveFull #WindowsFi
tech hu

tech hu

0 likes

An image illustrating a 'Windows Installation Failed' error message on a computer screen, highlighting the frustration of critical installation errors for Windows 10 or 11, and posing questions about potential causes like USB, hard drive, or TPM.
This image presents two solutions for Windows installation failure: 'The Peripherals Trick' (unplugging unnecessary devices) and 'Clean Boot' (disabling non-Microsoft services via msconfig to prevent conflicts). A screenshot of the System Configuration window is shown.
The image details 'Solution 3: Rebuild the BCD (Boot)' by using command prompt commands like `bootrec /fixmbr`, `bootrec /fixboot`, and `bootrec /rebuildbcd`. A terminal screenshot shows these commands being executed successfully to repair the boot process.
Windows Installation Failed? 🛠️ 3 Ways to Fix it
"Windows installation has failed" doesn't have to mean data loss. We’re breaking down the fix for hardware bottlenecks and showing why AOMEI Cloner is the ultimate recovery strategy. Implementation Details: For advanced setup perks and full feature validation, apply credentials: GRAB3
Information Lab

Information Lab

1 like

PC Takes Forever to Open Programs? Fix it Now!
Why PC takes forever to open programs? Read this post to get two practical methods to make your computer run faster. #PC #SLOW #program #windows
techease_zone

techease_zone

3 likes

C Drive Full? Clean & Free Up Disk Space FAST!
Is your C drive full? Learn simple ways to clean your Windows C drive and free up space quickly! Say goodbye to storage headaches. 🔗 Free solution in my bio if you need it #cdrive #storage #cleanup #windows #pctips
Tech SOS Hub

Tech SOS Hub

0 likes

This image is a title card for a guide on recovering permanently deleted files on Windows 11. It features the Windows 11 logo, a recycle bin with files, and a monitor, illustrating that deleted data can be restored using built-in options and trusted tools.
This image details the first three methods for recovering deleted files on Windows 11. It lists steps for 'Undo Delete (Immediate Recovery)', 'File History Restoration', and 'System Image Recovery', providing clear instructions for each recovery option.
This image presents the remaining three methods for recovering deleted files on Windows 11. It outlines steps for 'Command Prompt Recovery', 'Windows File Recovery Tool', and using 'Third-Party Software', completing the list of six recovery options.
Deleted Files on Windows 11? Recover in Minutes
Accidentally deleted important files on Windows 11? This guide covers the best recovery methods using Recycle Bin, File History, Previous Versions, and professional recovery tools. Learn how deleted data can still be restored, why acting quickly matters, and how to recover documents, photos, and vi
XanthusTechCore

XanthusTechCore

1 like

How to Increase C Drive Space in Windows 11/10/8/7
Need more room on your C drive? This post will show you how to increase C drive space in Windows 11/10/8/7 safely and effortlessly. #increase #cdrive #space #windows #extend
techease_zone

techease_zone

0 likes

Backup Windows 11 Completely-No Data Loss
PC won't start? Blue screen of death? 😱 A simple file backup won't save you now. In this video, I'll show you how to back up all of Windows 11, including programs, drivers, and settings. Restore your system in minutes after a crash instead of spending hours reinstalling everything. 👉 Pr
SmoothTechie

SmoothTechie

0 likes

💿 Deleted an Windows ISO File? Recover It Quickly.
Accidentally deleted an important ISO file like a Windows installer, game image, or backup disc image? Don’t panic—deleted ISO files are often recoverable if they haven’t been overwritten. This guide explains how to restore ISO files using Recycle Bin, Windows backups, and professional recovery too
XanthusTechCore

XanthusTechCore

3 likes

3 Easy Steps to Transfer C Drive to SSD in Windows
Upgrading from an HDD to an SSD is a smart move. This guide will show you how to transfer your C drive to a new SSD and ensure it remains fully bootable afterward. #transfer #cdrive #ssd #windows #clone
Techcrafter

Techcrafter

1 like

☁️ Restore OneDrive Files Back to Your PC
Need to get your OneDrive files back on your computer? This video shows how to restore synced files, recover deleted OneDrive data, download files from the cloud, and use OneDrive's restore features to bring your files back safely. #datarecovery #cloudbackup #windowstutorial #onedrive
XanthusTechCore

XanthusTechCore

0 likes

The image introduces how to backup programs in Windows without reinstalling, addressing users who are changing PCs or reinstalling Windows. It highlights saving and recovering programs on Windows 11, 10, 8, and 7 in minutes.
This image details Method 1 using AOMEI Backupper. It shows steps to install, open, select 'System Backup,' choose a destination path, and start the backup process, with a screenshot of the software interface.
The image illustrates Method 2 using a Windows tool. It outlines steps to create a system image via Control Panel, including choosing a save location and confirming drives, while also listing limitations like NTFS only and no incremental backups.
Don’t Reinstall Programs After Windows Reset
Switching PCs or reinstalling Windows? Back up all installed programs and restore them in one click. No more reinstalling everything from scratch. Tool used: AOMEI Backupper Details: code.aomeitech.com #askmeanything #windows #techtok #fyp
Information Lab

Information Lab

1 like

2 Easy Ways to Move Programs from C to D Drive
In this guide, you'll learn 2 practical ways to move programs from C to D, along with useful tips to free up disk space. #program #move #cdrive #pctips #windows
SmoothTechie

SmoothTechie

2 likes

Quick Tips: Fix My C Drive Is Full Without Reason
Sometimes, you may find your C drive is full without reason. Here we discuss some possible reasons and offer both quick and advanced tips to fix it. #cdrive #full #disk #windows #extend
Techcrafter

Techcrafter

0 likes

Move C Drive to Larger Disk? Realize it Here!
If you need to move C drive to larger disk for more room, you can read this post to get the right software. With it, you can easily transfer your system drive to a bigger disk—no reinstallation required. Giveaway License Code: AMAB-CQM69-746DU-TAR0D #move #disk #windows
techease_zone

techease_zone

1 like

How to Replace a Hard Drive on Windows 10/11
Replacing a hard drive on Windows 10/11 is easier than you think. You don't need to reinstall Windows or lose your data. Just clone your old drive to the new one with AOMEI Cloner. It copies Windows, apps, and files exactly as they are. #replace #hdd #clone #windows #disk
SmoothTechie

SmoothTechie

0 likes

See more