Member Avatar for bryann

I have a PC with 2 drives. A SSD which has my OS installed and a traditional HDD which has all my files and most of my programs on it.
My question is do I have to install my new anti-virus on the OS drive or can if funciton properly on my second drive?

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  • Latest Post Latest Post by JorgeM

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Short answer: you can put the antivirus' visible program files on the second drive, but the protection itself must integrate with the OS and will therefore place key components and configuration on the system volume. is right that installing while logged in lets the product register services and hooks with the OS, and for an SSD-C (OS) + HDD-D (data) setup the safest option is the vendor's default install path.

Why that matters: real‑time protection relies on drivers, services and registry entries that the OS loads at boot. If the installer is allowed to copy only userland files to D: while core drivers or scheduled tasks remain on C:, everything still works — but if the AV were installed in a way that assumes the program folder will always be available before the system finishes startup, problems can occur (missed updates, failed services, broken quarantine). Also scanning the large HDD will be slower than scanning the SSD; that is about performance, not capability.

Practical checklist

  • Use the AV installer’s recommended (default) options.
  • After install, confirm “on‑access” (real‑time) scanning is enabled for all fixed drives.
  • Ensure the data drive uses a stable drive letter and is mounted early in boot.
  • Check where definitions and quarantine are stored so there is enough free space.
  • Schedule periodic full scans (or offline rescue scans) that include the HDD.
  • If the vendor refuses a non‑system install or warns during setup, install on C: — don’t move files manually.

A final note on SSD wear: modern SSDs handle AV updates and logs easily; avoiding protection to save a few writes is not worth the security risk. If you want absolute control, pick an AV whose installer documents exact locations for drivers, databases and quarantine so you can confirm behavior before you change defaults.

Member Avatar for JorgeM

You install the av program while logged into the PC. Where you tell the av program to extract its contents for it to run has no bearing on what the av program is able to do.

it doesn't matter if the av program files are installed on either drive. Those specifics are and other config are generally stored in the registry. The av program will most likely install as a service or during the installation the program will update the part of the registry that loads programs at startup so the OS knows how to start the av engine.

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