Turn on suggestions
![]() Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
Reply
Topic Options
Re: Sandisk Extreme 64GB - Slower write speeds after system format[ Edited ]Options
06-13-2016 07:51 AM - edited 06-13-2016 07:53 AM @moogle
>>Using SecureErase in PartedMagic has restored it back to normal
when you said "it is back to normal" by using SE/PM, I'd like to ask you 2 questions on top of this:
Thanks, Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
06-13-2016 08:16 AM
Hi zakear,
1. Yes, I used CrystalDiskMark to test read and write speeds on two different 64GB drives. One was formatted to NTFS and the other was left as exFAT like when it came from the factory. The speeds were roughly about 32-34 MB/s read and 12-15 MB/s write on the sequential parts of the benchmark. Both drives were performing similarly poor after having been used for a year and filled up many times.
2. After the SecureErase (I booted to linux and used hdparm instead of the gui tool as I couldn't see my flash drive. See this page https://blog.oxplot.com/make-usb-flash-write-fast-again/ on what commands to use.) the drive no longer has a filesystem so I formatted it back to NTFS 4K cluster size using Windows 10.
I went and performed the CrystalDisk benchmark and speeds were back up to around 211 MB/s read and 139 MB/s write which seemed back to normal speeds.
I also tried copying a large file to the drive before and after secureerase in Windows 10 and before I was getting around 3-5MB/s write speeds, afterwards the drive was copying at around 95MB/s for about 10 mins (the time it took the transfer to complete) which seemed about right as I was copying from HDD -> Sandisk drive.
The drive was hot afterwards but back and performing normally. All these posts about ruining the factory partition/sector size is just rubbish. The drive uses SSD flash chips but I don't think there is a controller embedded inside to automatically perform TRIM commands or do wear levelling, which is why the drive will slow down over time with use.
Maybe a majority of users who rarely use the drive to copy large files won't see an issue, but if you use the drive too much it will slow down significantly.
Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
07-12-2016 03:40 AM Hi !
I've just formated my drive with the Windows tool in exFat (see screenshot below) and I got the same speed as you.
Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
11-14-2016 01:04 PM moogle wrote: 2. After the SecureErase (I booted to linux and used hdparm instead of the gui tool as I couldn't see my flash drive. See this page https://blog.oxplot.com/make-usb-flash-write-fast-again/ on what commands to use.) the drive no longer has a filesystem so I formatted it back to NTFS 4K cluster size using Windows 10.
Its abit overcomplicated, why u use linux commands when u already secure erased your drive with partedmagic? Format Type: Quick Format Size Adjustment: On
Thats it my speed went up again.
The good thing about SDFormatter is he sets the correct alignment automaticly, u can check that with AS SSD Benchmark tool (see screenshot) if there is ok you are good, if there is BAD you are i guess u know it so i think the stick loses speed if there is a wrong alignment.
Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
07-24-2018 04:08 AM Just wanted to let you guys know that secure delete via "hdparm" worked fine for me on Linux.
dev/X = drive name, for example /dev/sdg
My speeds went from 10MB / sec to over 200MB / sec again
Best regards, IT-Technik Klimt Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
07-26-2018 06:12 PM But don't you then have to format the drive? And for 64GB as exFAT?
Ed
Important files = Backed up files Re: Sandisk Extreme 64GB - Slower write speeds after system format[ Edited ]Options
08-14-2018 03:34 AM - edited 08-14-2018 03:40 AM Just off the phone with Sandisk support. Their USB sticks and memory cards are ment to be formatted.
Just like SSDs, no way you can physically break your USB disk or have it's performance degraded by formatting it (however obviously you will loose data on it). Well, not as long as you format it 24/7 for a couple of years (wear out memory chips by writing data more times than it's been designed to handle; and those are pretty generous nowadays anyways).
So happy formatting, people! Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
12-13-2018 06:41 AM I made secure eraze in Disk Utility on mac os with exFat option and 1 Security (it was about 1 hour) level and it works back fast as new! Re: Sandisk Extreme 64GB - Slower write speeds after system format[ Edited ]Options
02-22-2019 11:01 AM - edited 02-22-2019 11:05 AM Hi,
I just came accros this topic and want to add my findings.
I bought a SANDISK Cruzer Ultra Flair 3.0 128 GB, which didn't let me copy files larger then 4Gb. (on windows and linux) Trying to find an solution I read about the three file systems and their differences: Fat32, exFat and NTSF. Two different windows computers showed that the usb-stick was formatted as exFAT.
As a test I tried to copy an .iso file from 4.7Gb to the stick. All attemps failed, a message stated: the file is too large. Then I re-formatted (slow) the stick in a windows computer to exFAT. After that I was able to copy the 4.7Gb .iso file to the usb-stick.
It looks like as if Sandisk is using a modified exFAT file system, perhaps to support their SanDiskSecureAccess environment. (as a result, customers are not able to share easily (high resolution holiday It would be nice to know if it is a modified exFAT file sytem or not.
Re: Sandisk Extreme 64GB - Slower write speeds after system formatOptions
02-24-2019 08:56 PM HIGHly unlikely it was a modified exFAT file system. A counterfeit drive, maybe.
Ed
Important files = Backed up files |