Hot answers tagged trim
22
My understanding of this phenomenon is that it affects the longevity of the drive more than it affects the performance, at least from what an end user observes.
SSD media can only write to empty file pages, but they can only erase a file block (collection of pages, normally around 128). Without TRIM (which the OS uses to tell the drive which pages and ...
15
I have a OCZ Summit SSD in my work laptop running Win7 x64. I had installed the drive just prior to the firmware update that enabled TRIM so I was running for a long time with no TRIM. I noticed some pretty substantial performance problems after a few months. It became unbearable when, after installing an Apple bluetooth mouse, the cursor would ...
13
Notice that you probably need a more recent kernel than 2.6.28, see here (based on 2.6.30-rc4 with last activity in May this year). I do not know to what degree that tree has been merged, maybe you can search the linux-ide@vger.kernel.org mailing list. Update: see for instance this thread (also discussed on the kernel list).
For using TRIM you are probably ...
13
According to the Crucial User Forums - Is TRIM Running? to test if TRIM is enabled run "fsutil behavior query disabledeletenotify" in an administrative command window.
If it comes up as 0 then it is enabled.
Have a read of the comments of Support and Q&A for Solid-State Drives and this Intel Community Forum for more info.
9
I'm still looking for an authoritative answer, but I noticed that on my machine, automatic defragging is scheduled for all of my HDDs, but not my SSD. I think this means Windows is recognizing the disk as an SSD.
The click-by-click version of the answer:
1) Right click on a disk drive, go to properties.
2) Select the Tools tab and click on Defragment ...
9
Flash memory devices (what's used for today's SSDs) can't write arbitrary data at any moment; before writing on a cell (typically 4KB) has to be erased first. Unfortunately, the erase operation is very slow; that's why flash devices were so much slower than magnetic drives, despite having no moving parts.
Modern SSDs hide the erasing time by maintaining a ...
8
Whether TRIM is useful or not depends on the controller and firmware used in the SSD. In a good SSD implementation (Intel's, and probably a few others), the drive can use “unused” blocks as scratch areas to help even out the performance and ‘wear’ of the device. When a drive is fresh from the factory, it starts out with every block in an “unused” state. As ...
7
There are two detailed articles about SSD and TRIM (for Mac and PC) here and here.
To cut a long story short, on Windows you really need TRIM, or have to do some careful configuration. On Mac, for some reason, it seems to work pretty well without trim.
(By the way, Jeff blogged about this yesterday...)
7
I just did a bunch of research on using TRIM with my Intel X25-M drive. I had a hard time finding everything in one place (probably since it's so new), so I wrote up a quick how-to guide. Hope this helps:
http://cptl.org/wp/index.php/2010/03/30/tuning-solid-state-drives-in-linux/
7
A user reviewing the Intel 320 SSD claims the following:
The 320 behaves a lot like the old X25-M G2 did when tortured. Minimum
performance drops pretty low - Intel prefers cleaning up as late as
possible to extend drive longevity. As a result, I wouldn't recommend
using the 320 in an OS without TRIM support.
You can see the difference in the ...
7
TRIM was introduced so an Operating System (the File System within the OS) could communicate to an ATA storage medium that a sector is no longer being used by the file system. This has nothing to do with writing to the disk.
TRIM does not guarantee the sector is zeroed on the media. It does guarantee when the file system requests a read from that sector ...
7
The SU thread How do I know if my SSD Drive supports TRIM discusses this same question.
This answer remarks that "DisableDeleteNotify=0" means that TRIM is enabled in Windows. This only means that TRIM commands will be sent to the disk driver, which might either ignore it or send it to the firmware, which in its turn will either ignore it or use it to good ...
7
This is excessive for a non-enterprise SSD. To put this in comparison, for Intel consumer SSDs (which are commonly considered by far the best drives on the market in terms of reliability rather than raw benchmark numbers), Intel guarantees that they'll do 20GB of writes per day for the entire warranty period without exhausting the drive. You're doing ...
6
dBpoweramp Music Converter (dMC) is free and can batch process audio files and has a DSP Effects plugin which includes:
Trim Silence: remove silence from beginning or end
5
Edit: For some systems, Intel now supports passing the TRIM command to SSDs in RAID-0. The requirements are:
A 7-series motherboard (6-series chipsets are unfortunately not supported).
Intel's Rapid Storage Technology (RST) for RAID driver version 11.0 or greater (11.2 is the current release)
Windows 7 (Windows 8 support is forthcoming)
...
5
TRIM still does not seem to be supported on RAID, whether software or hardware or level 0 or more, and it also seems that Microsoft is not to blame in this case.
From Intel Rapid Storage Technology :
Is there TRIM support for RAID configurations?
Intel® Rapid Storage Technology 9.6
supports TRIM in AHCI mode and in RAID
mode for drives that are ...
5
For some reason VLC has removed options to stream a partial clip from their transcoding and streaming wizards. But the options are still available at the cli.
Here's how I stream a portion of a file, while keeping the original audio and video streams intact (no transcoding done). Times are given in seconds:
vlc in.avi --start-time 65 --stop-time 95 ...
5
hdparm --trim-sector-ranges is low level, it is supposed to talk directly to the SSD, so no dependency on the filesystem. What wiper.sh does is use filesystem specific programs to map free (filesystem) regions to (hardware) SSD sectors, them use hdparm to trim those.
Answering the question, you can use hdparm to trim that partition, but you should be very ...
5
According to Intel's website, TRIM is not supported for any RAID configurations at the moment:
TRIM support in Windows 7 [and 8] (in AHCI and RAID mode [only] for drives not part of a RAID volume)
Source: http://www.intel.com/support/chipsets/imsm/sb/cs-022304.htm
That page is dated 04-Oct-2012, so pretty recent, too. Their latest SSD Toolbox FAQ ...
5
Defrag a SSD will not improve performance, actually it could decrease performance due to the fact that a lot of file copies would be made, filling the SSD with more garbage to SSD garbage collector:
Defragmenting an SSD is a terrible idea, for several reasons:
The key benefit to SSDs is that they have virtually no seek time.
Reading adjacent ...
5
Yes. Most performance is gained in an SSD from eliminating seek time, which the SSD would still do. The problem is going to be XP does not support TRIM, so you will see performance gains, but the drive will also wear out substantially faster on XP than windows 7. If I were you, I would buy an SSD and Windows 7 for the machine.
4
Formatting a disk is not always equivalent to performing a manual TRIM on a drive - it depends if the format utility has explicit support for it. The Windows 7 format command does happen to have support for this. As for the difference between quick/full formats on Windows, if you do a quick format, it simply deletes the partition table and file listing. ...
4
Moving files to the Recycle Bin is only a directory change. As the files are not physically moved on the disk, no additional writing is done on the SSD, so no harm is done by keeping the Recycle Bin enabled on the SSD.
Disabling the Recycle Bin only means that files are deleted and trimmed immediately, but with no real benefits compared with their being ...
4
The TRIM command has only been supported on Ext4 since kernel version 2.6.33. It is disabled by default (as it is slightly experimental), but can be enabled with the mount option "discard".
4
I looked into this again (six months after my original post) and had much better luck: I found the ATA Secure Erase wiki entry. It shows you how to use hdparm to tell the SSD to do a "Secure Erase". From the article:
When a Secure Erase is issued against a SSD drive all its cells will be marked as empty, restoring it to factory default write ...
3
Update: Here are some quotes from an (older) Microsoft presentation on SSDs
It mentions that if the SSD follows SATA guidelines, then Windows 7 is able to recognize it and adjust accordingly. Regardless of being the primary or secondary drive.
SSD can identify itself differently
from HDD in ATA as defined by ATA8-ACS
Identify Word 217: Nominal ...
3
One thing to be aware of is that SSDs tend to perform better the more free space that is on the drive. So, get the largest capacity drive you can afford, and be aware that filling it close to its capacity may hinder performance (especially if TRIM is not supported).
3
Well the best I can do is point you to articles (short of re-writing and summarizing the content) that I have seen on the subject, initially it seems that MacOsx isn't the best at dealing with SSD's yet...
References:
http://forums.macrumors.com/showthread.php?t=658153
http://www.ocztechnologyforum.com/forum/showthread.php?t=52845
...
3
Until there're better answers you can use indirect clues from the latest AnandTech article on SSDs: The SSD Improv: Intel & Indilinx get TRIM, Kingston Brings Intel Down to $115:
TRIM won't work on a RAID array.
(Other information previously here about non-MS drivers not supporting TRIM was out of date.
For example, Intel added TRIM in March ...
3
I wrote a command line program to check if TRIM is enabled:
Download & source code
trimcheck
This program provides an easy way to test whether TRIM works on your SSD. It uses a similar method to the one described here, but uses sector calculations to avoid searching the entire drive for the sought pattern. It also pads the sought data with 32MB ...
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