You’ve got a few good options, and it mostly comes down to speed, size, and convenience.

• Type: External USB hard drives and portable SSDs that connect directly over USB are commonly used with PS4.
• USB spec: Look for USB 3.0 (or newer). Newer USB versions are typically backward compatible for this use.
• Capacity: Many PS4-compatible drives on Walmart.com range from 1TB up to larger sizes for big libraries.
• Form factor: Portable (bus‑powered) drives keep things simple with one cable; desktop drives may require their own power.
• Setup: Drives labeled “for PS4” can streamline setup, and the console can format compatible drives during setup if needed.

This message can appear for simple connection or format reasons. A few quick checks can help:

1. Reseat and swap ports: Unplug/replug the cable firmly and try a different USB port. Avoid USB hubs.
2. Use a proper cable: A short, quality USB 3.x cable can improve stability.
3. Power the drive: If it’s a desktop drive, plug in its AC adapter. Portable drives should get enough power from the console.
4. Format on the console: If the PS4 prompts to format, follow the on‑screen steps so it’s prepared for use.
5. Test the hardware: Try the drive on another device, and restart the console to clear temporary glitches.

If the issue persists, the enclosure or drive may need further diagnostics.

That prompt usually means the console needs a USB storage device for a specific task. Common scenarios include:

• System update or reinstallation: In certain modes, the console may ask you to connect a USB drive prepared with system software files.
• Backup or restore: You might be starting a process that saves or restores data using an external drive.
• Extended storage: The PS4 may be asking you to connect your game storage drive so it can access installed titles.

Review the on‑screen instructions carefully. Depending on the message, you may need to prepare a USB drive in a specific way (format and folder setup) or simply connect your existing external drive so the console can proceed.

There are a few things you can try before using a USB drive:

1. Restart: Choose the Restart option in Safe Mode and see if the console boots normally.
2. Power cycle: Turn off the console, unplug it for about a minute, then plug back in and start it up.
3. Check connections: Reseat the HDMI and power cables and try a different display input if possible.
4. Other Safe Mode options: If available, options that don’t erase data (such as rebuilding the database) can sometimes help.

If the console continues to request system software, you may need a properly prepared USB drive to update or reinstall. Steps vary by situation, and results can depend on the specific error shown.

It depends on how many games you keep installed and whether you prefer speed or capacity:

• Smaller libraries: Around 1TB can work if you rotate games often.
• Growing libraries: 2TB–4TB offers comfortable headroom for many modern titles.
• Large collections: Higher capacities (like 6TB–8TB) reduce the need to delete games.
• HDD vs. SSD: HDDs typically offer more storage per dollar, while SSDs can help with responsiveness. Actual results vary by game and setup.
• Practical tips: Portable (bus‑powered) drives keep your setup tidy; desktop drives can suit stationary setups. On Walmart.com, filter by capacity and “PS4‑compatible” to narrow your choices.