Verdict: for SD cards and USB drives on Windows, Win32 Disk Imager is the simpler, more focused choice, especially when you want a .img backup you can restore with the same tool. HDD Raw Copy Tool is the tool to look at when the job is bigger or more drive-shaped: raw copying involving hard drives, or copying directly from one device to another, rather than a simple card image workflow. Both are raw tools, not file copiers, so the choice is about the shape of the job, not about which one copies files faster.
Win32 Disk Imager, version 1.0.0 from 2017-03-08, is a Windows-only, GPLv2 raw-imaging tool for .img files. Read copies a whole device sector by sector to an .img file, and Write copies an .img file sector by sector to a drive, overwriting the entire destination. It has no compression, so a read-back equals the full device size; no command-line interface; no scheduled imaging; and no validation beyond the Verify Image feature in v1.0.0. It does not parse ISO filesystems. HDD Raw Copy Tool, by contrast, is positioned as a raw copy utility for drives in general, including hard drives, which makes it a natural candidate when the source or target is not a small removable card.
Comparison at a glance
| Feature | Win32 Disk Imager | HDD Raw Copy Tool |
|---|---|---|
| Platform | Windows only | Windows |
| Typical job | SD card and USB .img imaging | Raw copying involving hard drives and devices |
| Write a raw image | Yes, .img to drive | Yes, raw copy to device or file |
| Read a device back | Yes, full device to .img | Yes, raw copy from device |
| Device-to-device copy | Not its workflow; file in the middle | Positioned for direct device copying |
| Compression | None; output equals full device size | Check current documentation for options |
| Built-in validation | Verify Image in v1.0.0 | Check current documentation for options |
| Maintenance status | Legacy; last release 2017-03-08 | Check the project page for current status |
| Price | Free | Free |
Where HDD Raw Copy Tool fits better
When the device is a hard drive rather than a memory card, the workflow changes. You may be copying a whole drive to another drive of the same size or larger, or capturing a drive to a file for later restoration, and you may care less about the .img ecosystem around Raspberry Pi cards and more about raw throughput and device handling. A tool positioned for hard-drive raw copying speaks to that job directly, including device-to-device copies that avoid an intermediate file altogether. If that describes your task, Win32 Disk Imager’s card-centred .img workflow will feel like the wrong shape, even though the underlying sector copying is similar.
That said, do not assume extra features. Raw copy tools vary in their handling of bad sectors, large drives, and verification, and those behaviours can change between versions. Before trusting any raw copy with irreplaceable data, read the tool’s current documentation, test the restore on a spare drive if you can, and keep the original untouched until the copy is verified. That caution applies to Win32 Disk Imager too.
Where Win32 Disk Imager fits better
For removable media, Win32 Disk Imager’s simplicity is an advantage. The interface is a drive picker, a file picker, and Read and Write. There is no device-to-device mode to misconfigure and no hard-drive-specific options to puzzle over. A Pi card backup is a Read, a restore is a Write, and the file in the middle is a standard .img file you can compress, archive, or share. See how to back up an SD card to an .img file and verifying an image without rewriting for the core workflow.
The limits remain: full-size output with no compression, Windows-only, no command line, no scheduling, and legacy maintenance status. If you need automatic backups or cross-platform use, neither tool in this comparison is the complete answer, and you should look at a dedicated backup solution rather than stretching a raw imager into that role.
When Win32 Disk Imager is still the right pick
- The job is an SD card or USB drive and a .img file.
- You want the simplest possible read-back and restore cycle on Windows.
- You want a file you can archive, compress, and restore later with the same tool.
When to switch to HDD Raw Copy Tool
- The job involves a hard drive or a direct device-to-device copy.
- An intermediate .img file is an unnecessary step for your workflow.
- You need raw copying behaviour tuned for drives rather than cards.
If your job is really about the command line rather than another GUI tool, see Win32 Disk Imager vs dd on Windows. Get Win32 Disk Imager from the download page.
Frequently asked questions
Is HDD Raw Copy Tool the same kind of tool as Win32 Disk Imager?
Broadly, yes: both work at the raw sector level rather than copying individual files. Win32 Disk Imager is focused on .img files for cards and USB drives, while HDD Raw Copy Tool is positioned around raw copying to and from hard drives and other devices.
Which is better for backing up an SD card?
For a straightforward SD card backup on Windows, Win32 Disk Imager is the simpler fit: its Read button produces a .img file you can restore with the same tool. HDD Raw Copy Tool is worth considering when the job involves a hard drive or a device-to-device copy.
Do both tools overwrite the destination completely?
Yes. Raw copying replaces the destination. With Win32 Disk Imager, Write overwrites the entire destination drive, so always verify the drive before starting.
Can either tool compress a backup?
Win32 Disk Imager does not compress: a read-back equals the full device size. Compress the resulting file afterwards if space matters. Check HDD Raw Copy Tool’s current documentation for its own options rather than assuming.