{"id":28,"date":"2026-09-23T14:21:24","date_gmt":"2026-09-23T14:21:24","guid":{"rendered":"https:\/\/spyonsecurity.com\/blog\/?p=28"},"modified":"2026-09-23T14:21:24","modified_gmt":"2026-09-23T14:21:24","slug":"cctv-storage-how-many-days-4tb-drive","status":"publish","type":"post","link":"https:\/\/spyonsecurity.com\/blog\/cctv-storage-how-many-days-4tb-drive\/","title":{"rendered":"CCTV Storage: How Many Days of Footage Does a 4TB Drive Hold?"},"content":{"rendered":"
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“How many days of footage does a 4TB drive hold?” is one of the most common questions we get, and the honest answer is that it depends far more on your settings than on your drive. Two identical 4TB drives on two identical camera systems can hold 12 days or 30 days of footage. The difference is compression \u2014 which codec your cameras and recorder are using, and at what bitrate.<\/p>\n

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https:\/\/www.youtube.com\/shorts\/himIdTkzTD4<\/div>\n<\/figure>\n

What actually decides how many days you keep<\/h2>\n

Storage is simple arithmetic: the data each camera writes per second, multiplied by the number of cameras and the hours you record. The drive fills, the recorder starts overwriting the oldest footage, and that overwrite point is your retention window.<\/p>\n

Most people try to buy their way out of a short window with a bigger drive. That works, but it is the expensive route. Cutting the data each camera writes is usually free \u2014 it is a setting change \u2014 and it often doubles the same drive’s history.<\/p>\n

H.264 vs H.265 vs H.265+<\/h2>\n

H.264 is the older compression standard. It still works and it is still everywhere, but it writes a lot of redundant data. H.265 (also called HEVC) does the same job at roughly 40 to 50 per cent less storage for the same picture quality. If your system is running H.264 and the hardware supports H.265, switching is the single biggest win available to you.<\/p>\n

H.265+ goes further with smart coding. Instead of writing a full picture of your empty driveway every second, it records the static background once and then only writes what changes. On a quiet scene \u2014 a back gate, a warehouse aisle overnight, a parking lot at 3am \u2014 savings of up to 70 per cent are realistic.<\/p>\n

There is one catch that trips up a lot of installs: your cameras and your recorder both have to support the codec.<\/strong> An H.265 camera feeding an H.264-only NVR gains you nothing. Check both sides before you assume you are covered.<\/p>\n

Bitrate and frame rate: the settings nobody checks<\/h2>\n

Codec is the headline, but bitrate is the dial that controls file size. A camera set to a needlessly high constant bitrate will fill a drive fast whichever codec it uses. Variable bitrate, which lets the camera write less when nothing is happening, is the better choice for fixed-view cameras.<\/p>\n

Frame rate is the other quiet waster. Thirty frames per second is smooth video, and on a till or a loading bay it can be worth having. On a camera pointed at a back gate that sees three people a week, 30fps is storage you are throwing away. Twelve to fifteen frames per second is enough to identify a person and what they did, and it can halve that camera’s footprint. The same logic applies to resolution: an 8MP camera on a narrow side path writes four times the data of a 2MP camera to show you the same fence.<\/p>\n

What we recommend for Kitchener-Waterloo homes and businesses<\/h2>\n

For a typical Kitchener or Waterloo home with four to six cameras, we aim for 30 days of retention. That number is not arbitrary \u2014 most people do not discover a problem the day it happens. A package goes missing, a vehicle gets scratched, a neighbour mentions something odd from last week. A 12-day window often does not survive that delay, and the footage is gone by the time anyone goes looking.<\/p>\n

For businesses across Cambridge and Guelph \u2014 warehouses, shops, contractor yards \u2014 we often go further, since insurance claims can arrive weeks after the incident.<\/p>\n

Two local details are worth planning around. Our winters mean long dark evenings, and infrared night mode introduces image noise that compresses poorly, so drives fill faster from November through March than they do in July \u2014 budget for that rather than being surprised by it. And if your recorder sits in an unheated garage or outbuilding, cold and condensation shorten hard drive life; a surveillance-rated drive in a heated space is worth the difference. Long rural driveways and farm properties tend to have cameras on very static scenes, which is exactly where H.265+ pays off most.<\/p>\n

FAQ<\/h2>\n

How many days should my CCTV system keep?<\/h3>\n

Thirty days is a sensible target for most homes and small businesses. It covers the common case of finding out about an incident a week or two later, and it is achievable on modest hardware once compression is set up properly.<\/p>\n

Can I switch my existing system to H.265?<\/h3>\n

Often yes, if both the cameras and the recorder support it. It is a settings change, not a hardware purchase. Some older systems need a firmware update first, and genuinely old equipment may be H.264 only \u2014 in which case a bigger drive or lower frame rates are the remaining levers.<\/p>\n

Will better compression make my footage look worse?<\/h3>\n

No. H.265 delivers comparable picture quality at a much lower bitrate \u2014 that is the point of a newer codec. Quality problems in CCTV footage almost always come from the lens, the sensor, the lighting or the placement, not the codec.<\/p>\n

If you are not sure how many days your system holds, we will check it at no cost. SpyonSecurity offers a free site survey across Kitchener, Waterloo, Cambridge and Guelph \u2014 we will review your codec and bitrate settings, tell you your real retention window, and spec the drive you need if a change is warranted. Call 226-227-7966<\/strong> or get in touch here<\/a>.<\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"

Two identical 4TB drives can hold 12 days or 30 days of CCTV footage. Here is what actually decides it, and how to get more history from the same hardware.<\/p>\n","protected":false},"author":1,"featured_media":27,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1],"tags":[],"class_list":["post-28","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","entry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/spyonsecurity.com\/blog\/wp-content\/uploads\/2026\/09\/cctv-storage-how-many-days-4tb-drive.jpg","_links":{"self":[{"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/posts\/28","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/comments?post=28"}],"version-history":[{"count":1,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/posts\/28\/revisions"}],"predecessor-version":[{"id":29,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/posts\/28\/revisions\/29"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/media\/27"}],"wp:attachment":[{"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/media?parent=28"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/categories?post=28"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spyonsecurity.com\/blog\/wp-json\/wp\/v2\/tags?post=28"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}