"My PC tells me"?
Do you mean Disk Cleanup or similar utility?
If you compress files you will save some disk spaces but the compressed files will take slightly longer to open when you use them.
Don't know about creating a compressed drive.
This thread is now locked and can not be replied to.
iPhone 7 review: a range of small updates add up to an excellent phone
1995-2015: How technology has changed the world in 20 years
How New York’s Stylin’ Seniors became a golden social media campaign
23 Apple Watch tips & secret features: Master your Apple Watch, Apple Watch Series 1 or Apple…
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.