![]() ![]() “If your drive is consistently more than 75 or 80 percent full, upgrading to a larger SSD is worth considering.” ( Source.) ![]() “You generally want to leave about 10% free to avoid fragmentation.” ( Source.) “I would recommend 10% plus on Windows because defrag won't run if there is not about that much free on the drive when you run it.” ( Source.) “I would say typically 15%, however with how large hard drives are now adays, as long as you have enough for your temp files and swap file, technically you are safe.” ( Source.) I currently leave 33% percent free and and vow to not get below 10GB free HDD space.” ( Source.) “You should leave room for the swap files and temporary files. “I've been told I should leave about 20% free on a HD for better performance, that a HD really slows down when it's close to full.” ( Source.) “To keep the garbage collection going at peak efficiency, traditional advice is aim to keep 20 to 30 percent of your drive empty.” ( Source.) If they hit 90% full, you should consider your own personal pants to be on actual fire, and react with an appropriate amount of immediacy to remedy that.” ( Source.) “Once your disk(s) are 80% full, you should consider them full, and you should immediately be either deleting things or upgrading. As such, these claims, while perhaps reasonable in practice, have a mythical air about them. Various reasons for this are given, or sometimes no reason at all. journalistic) technology press, and in online technology blogs and discussion forums, one commonly encounters anecdotal advice to leave some amount of space free on hard disk drives or solid state drives. So this is why I said having TRIM is always better (than not having).In the informal (i.e. Even though they insist they don't need TRIM. The DuraWrite would even be helped by TRIM because there would be less data to be compressed and would result in even less write amplification. There is no direct TRIM replacement in the OWC's link. No need to move invalid data around which increases wear and tear (write amplification) and wastes space. With TRIM, the SSD's controller can selectively carry only valid data onto new location during garbage collection. If it is containing data, even if that data is invalid, it can't just be overwritten like on an HDD, it has to be erased (to become vacant) first. That location needs to be in "vacant" state. ![]() Problem number two: on an SSD, before a data can be written on a location. So before that time comes, the invalid data will get carried from place to place in "garbage collection". Without TRIM, the only time when the SSD's controller knows what data is invalid is when it receives a command from the OS to write on an LBA that is already containing data. It enables the SSD's controller to know what data is invalid/can be erased. So it doesn't know what data is valid (still in use) or invalid (deleted-not in use anymore). Now, problem number one on SSD's: when you delete a file on an SSD, the SSD's controller doesn't get to know or read the look up table. And when the time comes for writing on that location, the HDD head just overwrites it, no fuss. On an HDD, when you delete a file, what happens is the HDD's "look up table" gets updated so that the OS knows that location (LBA) can now be overwritten when needed.
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