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I was wondering how it would effect an SSD if this was checked:


I was just curious whether it would save my SSD disk space?

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5 Answers 5

up vote 2 down vote accepted

By enabling drive compression you would save space on your hard drive, however the benefit is not without cost. Compression uses processing power (CPU). Every time you access a file, it has to be read and uncompressed to be worked with. Every file you save or edit will also have to be compressed.

Whole disk compression is not a good method for growing storage, adding another hard drive or upgrading to a larger drive is a better choice.

Not that whole disk compression is bad, there are definite advantages in the right situations. However, "what if" is not one of them.

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Only add the NTFS compression to Files and folders where you read the data most of the time. DON'T ENABLE it for folders where you write data very often. With information being compressed on the fly, you're consuming more of an SSD's available write cycles than if you were writing the files uncompressed. This could have negative implications on the drive's endurance.

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It's a non-issue for most modern SSDs where the write endurance exceeds the expected device life by many times. –  David Schwartz Mar 18 '13 at 7:14

Compression can have a positive effect on a computer with an older, slower disk. The CPU may have enough horsepower so that doing decompression and compression on read/write is faster than letting the drive read the raw data. It has definitely speeded up my 5 yearold laptop.

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No. No, it didn't. You couldn't have posted a more completley wrong answer if you were trying, FYI. –  HopelessN00b Oct 16 at 9:18
To deny someone else's experience, spiced with an insult, without any explanation, is arrogant. You have to - at least - to come up with a proposal for the apparent increase in speed; your answer is mostly just condescending, annoying and immature. –  hlintrup Oct 17 at 10:19
No I don't. Your answer is simply wrong and absurd. –  HopelessN00b Oct 17 at 15:27
And why is it that on a Q&A site you don't have to supply suggestions to back your repeated statements. Unless you come up with something, anything, you're simply trolling and will be treated as such; you know, "Please do not feed the trolls.". Also, check out this link –  hlintrup Oct 18 at 20:53
@HopelessN00b Your name belays your knowledge base; you are deeply out of your depth. An older, slower disk will benefit greatly from whole disk compression, because it is intrinsically less able to deliver as much data per disk seek. By compressing you increase the effective information content of each seek, which drastically increases the effective speed of data transfer. This is well known and well studied in all communications since Shannon. The idea that you can encode information to more reliably convey in fewer bits is the foundation of modern communication via the end to end principle. –  Alice Dec 23 at 19:48

I don't think that compression would be all that bad on an SSD. Your operating system uses a temporary holding area for data that it needs to fetch when applications are loaded. Compressed files are decompressed and are loaded into this holding area. In Windows, this file is typically found on the root (C: presumably) of the drive. This file is called pagefile.sys. All major operating systems do this. Unix uses a special partition called the swap partition (for the ios and linux fans).

When your computer runs low on hard drive space, windows will adjust the size of how much data this file can hold thus hindering the performance of your computer when it has to shrink it because of limited resources. This is probably why hlintrup said he noticed a performance increase for his computer. He was probably out of space (hence why you would compress your file system). When he turned on file compression, it free'd up more room so the swap file could grow to an optimal size and applications could then be cached again.

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Okay, so i am running a Lenovo Twist and just compressed my SSD to save space. I gained 20 gb of space and do not notice much of a change in performance. –  Jay Stratemeyer Nov 9 at 5:04

I have consistently found that for Samsung 120GB, this is not guaranteed. I have found less free space after compressing the drive in the majority of cases.

  • Even on a multi-boot machine and compressing as a non-system drive before reboot.
  • The data would be 95% pre-compressed (BF4 etc).
  • The disks are over 90% full.

This leads me to believe there is an impact on overhead. Or the capacities are optimistically fudged and rely upon controller compression with a ceiling applied.

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