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Newbie
Posts: 2
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??? 

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SanDisk Guru
Posts: 4,494
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? 

Newbie
Posts: 2
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.