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SanDisk Guru
Posts: 2,605
Registered: ‎07-23-2010

Re: Sandisk Extreme 64GB - Slower write speeds after system format

"you're the expert here, right?"

 

Smiley Very Happy Hardly, but thanks for thinking so.  Smiley Happy

 

The initial format is a super floppy format; no MBR, no partition table, is FAT32 and a cluster size that I don't know.  It probably varies depending on the size of the flash drive.  I know of no app/utility that will recreate that format.  That doesn't mean one doesn't exist, just that I don't know of one.

 

If you have an app/utility/way to format the drive with different cluster sizes try formating it with different sizes and see if ones are better than others for you.

Ed
Important files = Backed up files
Newbie
Posts: 1
Registered: ‎08-28-2013

Re: Sandisk Extreme 64GB - Slower write speeds after system format

SanDisk Guru
Posts: 2,605
Registered: ‎07-23-2010

Re: Sandisk Extreme 64GB - Slower write speeds after system format

[ Edited ]

Thanks panas.  An interesting read.

Ed
Important files = Backed up files
Newbie
Posts: 2
Registered: ‎12-28-2013

Re: Sandisk Extreme 64GB - Slower write speeds after system format

i just bought one usb3 sandisk extreme 64GB,, at first the read & write speed were like 30 ~ 40 MB/s almost the same on both usb2 and usb3 ports,, i thought it was strange i formatted the disk to NTFS quick format,, but the speed didnt change,,

 

i solved this problem by updating my motherboard drivers like intel chepset, intel rapid storage, bios others ,,

 

after installing the drivers i restarted my pc, then the speed jumped to read speed around 150 ~ 250 MB/s

write speeds around  ~ 150 MB/s 

 

i was like whaaaat speed.

 

i think the problem most of the owners of this sandisk extreme usb3.0 is with drivers,, formatting does virtually nothing.

 

i hope this helps.

Newbie
Posts: 3
Registered: ‎04-28-2014

Re: Sandisk Extreme 64GB - Slower write speeds after system format

[ Edited ]

What you need to do before you ever format a usb drive is copy down its current structure and information about alignment and such. Then duplicate the structure and alignment using a formatting tool. If you don't know how to do that, you shouldn't be reformatting it. 

 

Regardless, here's a snapshot of of what the original factory default structure is like of a sandisk extreme usb 3.0 64GB drive

 

factory default structure

 

 

Use something like gparted (http://gparted.org/) and make 32K block size, align to 32K, start of the partition should be at 32K as well.

If the drive is still slow try doing a full format, not a quick format.

Newbie
Posts: 3
Registered: ‎04-28-2014

Re: Sandisk Extreme 64GB - Slower write speeds after system format

What I'm surprised about is why doesn't SanDisk just provide a tool that formats your drive to factory condition?

SanDisk Guru
Posts: 2,605
Registered: ‎07-23-2010

Re: Sandisk Extreme 64GB - Slower write speeds after system format

Because there is so little need to format the drives. 

Ed
Important files = Backed up files
Newbie
Posts: 3
Registered: ‎04-28-2014

Re: Sandisk Extreme 64GB - Slower write speeds after system format

Because there's no need for people to hold files larger than 4GB on a 64GB drive.  You MUST be daft.

SanDisk Guru
Posts: 2,605
Registered: ‎07-23-2010

Re: Sandisk Extreme 64GB - Slower write speeds after system format

Formatting for files larger than 4GB is the only reason to format the drive.  But NTFS has overhead, namely journelling, and that slows things down.  If small cluster sizes are choosen that doesn't help either.  And if the Windows system config for USB drives is set to Safety rather than Performance that also doesn't help.

 

So you formatted your flash drive to NTFS and now you want to format it back to FAT32?

Ed
Important files = Backed up files
Newbie
Posts: 7
Registered: ‎08-03-2014

Re: Sandisk Extreme 64GB - Slower write speeds after system format

[ Edited ]

I had horrible horrible writing speeds close to stalling after a very very nice thrust up until the 1gb mark. And yes my usb3 works fine on my other usb3 devices. I then tried enabling caching, and i WAS sure to remove it correctly. Only trouble was windows froze the device at one point. Could not release it, nor shutdown windows. I even waited 10-15 min to be sure. Now the drive is "broken" ie i NEEDED to reformat it. Hasnt been the same since. anyway kinda seperate problem i guess.

 

My reason being here is you Ed_P. Although polite you are still being kinda douchebag. I've NEVER heard that you are not supposed to format drives of any kind. We have been using it as a basic feature in dos/windows since the floppy drives, wth are you talking about when you say you are not supposed to reformat from stock. Frankly i feel cheated there wasnt a big red sticker on the box of the product warning you of this. I can't remember if this even came with a manual, but if it did, I read it. I always do, and I certainly don't remember this written anywhere.

You are blaming PeterMac and Yanos43, basicly saying they did this to themselves.

Are you employed by sandisk or what? or selfproclaimed sandisk guru? I sure hope its the last, because you are bad advertisement sorry

 

EDIT: and I could not believe this drive got shipped with fat32. It's 2014 why this **bleep** still exist. Imo reformating to a filesystem that supports 4gb+ files is an absolute must. For me drive is unusable without.

 

thanks to the last posts by people who came up with constructive replies