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Newbie
Posts: 4
Registered: ‎11-26-2018

Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

Just got my Portable SSD 480GB and got some very weird results when copying files to it from my local HDD.  One folder with 591 subfolders and 247,252 files that has a total file size of 9.12 GB is occupying 243 GB (yes, about 25 times bigger) on the SSD.  I have copied these same files to other flash drives, that were also formated to exFAT, and did not have this huge size differential (size on disk was only about 3 times bigger on disk).  Does anyone have any idea what might be going on??? 

SanDisk Guru
Posts: 4,548
Registered: ‎07-18-2007

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

the file size should not be different even to the extent of 3 time larger. Something is not right. How are you copying the files? Are the files compressed on the HDD? 

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Newbie
Posts: 4
Registered: ‎11-26-2018

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

Thanks for the rapid reply.  I'm not doing anything special just using Windows Explorer to copy the files. Same way with the new Portable SSD and the other media was a Sandisk 128GB micro SD card that was partitioned into 2 - 64GB partitions.  I have also copied these files to a Sandisk UltraFit 64GB flash drive.  Both the microSD and the UltraFit media had similar difference between the file size and the size on disk.  The files were not compressed on the HDD. The difference between sizes on the HDD is very small, only about .5GB. There are 1000's of files in the 10KB-40KB range. The HDD is formatted to NTFS and the SSD and microSD are both exFAT. I wonder if that could be causing problems?  Double checked again and files on HDD are not compressed. I just deleted all of the files that I copied originally and re-copied just one folder with about 8100 files and the stored size was 10 times the file size reported.

Newbie
Posts: 2
Registered: ‎01-10-2019

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

I am having a similar issue as OP. Using Mac OS, copied 54GB iphoto photoibrary from external HD and final result is over 300GB on extreme portable SSD. "Get Info" on folder is endless cycle of "calculating size" but DaisyDisk quickly reveals ultimate size. 54GB iphoto photolibrary is same size on multiple other external harddrives.

Newbie
Posts: 1
Registered: ‎03-03-2019

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

Did anyone find out what the issue is?  I also have this problem but not as bad.  

 

My EXTREME Portable 500GB drive is exFAT formatted.  It has 231,333 files, 5936 folders that should be using 253.02 GB.

 

Window is reporting 27.5 GB free of 465 GB.  I have lost over 200 GB somewhere.

Newbie
Posts: 1
Registered: ‎03-14-2019

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

Same here.

 

I copied 50 GB file onto the drive. Appeares to me that it take 300 GB. 

 

Anybody found any solution for this?

Newbie
Posts: 4
Registered: ‎11-26-2018

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

I had to re-format the SSD from exFAT to NTFS.  The drive came formated with exFAT sector size >2MB (sorry I don't rember exactly how big sector size was) and I was copying 1000's of 5-15KB size files. NTFS took care of the problem for me.  Might not work with old versions of Windows and Mac's. 

Newbie
Posts: 4
Registered: ‎11-26-2018

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

One thing I forgot to mention was that I chose 512 byte cluster size because of the small size of the most of the files I am storing on the drive.  You'll get better performance with a larger cluster size which would be better for media files like large video files at the cost of losing some file space. Not as much as the default Sandisk cluster size. As you can tell I'm not an expert but it worked for me. 

SanDisk User
Posts: 28
Registered: ‎04-24-2019

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes

[ Edited ]

@larryg92 wrote:

One thing I forgot to mention was that I chose 512 byte cluster size because of the small size of the most of the files I am storing on the drive.  You'll get better Vidmate iTunes Notepad++performance with a larger cluster size which would be better for media files like large video files at the cost of losing some file space. Not as much as the default Sandisk cluster size. As you can tell I'm not an expert but it worked for me. 


the file size should not be different even to the extent of 3 time larger. Something is not right. How are you copying the files? Are the files compressed on the HDD? 

 
SanDisk User
Posts: 28
Registered: ‎04-24-2019

Re: Storage size on Extreme Portable SSD unusually large. 25 times larger than total file sizes


@larryg92 wrote:

Thanks for the rapid reply.  I'm not doing anything special just using Windows Explorer to copy the files. Same way with the new Portable SSD and the other media was a Sandisk 128GB micro SD card that was partitioned into 2 - 64GB partitions.  I have also copied these files to a Sandisk UltraFit 64GB flash drive.  Both the microSD and the UltraFit media had similar difference between the file size and the size on disk.  The files were not compressed on the HDD. The difference between sizes on the HDD is very small, only about .5GB. There are 1000's of files in the 10KB-40KB range. The HDD is formatted to NTFS and the SSD and microSD are both exFAT. I wonder if that could be causing problems?  Double checked again and files on HDD are not compressed. I just deleted all of the files that I copied originally and re-copied just one folder with about 8100 files and the stored size was 10 times the file size reported.


files to it from my local HDD.  One folder with 591 subfolders and 247,252 files that has a total file size of 9.12 GB is occupying 243 GB (yes, about 25 times bigger) on the SSD.  I have copied these same files to other flash drives, that were also formated to exFAT, and did not