![]() The slow down stems from the controller on the SSD having to deal with recycling all the blocks with garbage data. The garbage collection process and strategies are programmed in the SSD controller firmware and differ amongst drive manufacturers.ĭrives that employ an efficient garbage collection process display good performance out of the box but also months later whereas drives that don’t, tend to slow down over time. This process of recycling previously deleted data is known as Garbage Collection. The SSD will need to erase the contents of the memory cell before writing to it. With all NAND Flash-based storage (USB Flash drives, SD cards, SSDs etc) that is not possible. When the OS issues a command to write data to a location that previously contained data, the HDD will write over the garbage data with no issue. ![]() In the case of a file deletion, the OS assumes the address where that file resided is now empty and can be written over again when needed. For the purpose of this document, we will call data deleted by the OS but still residing on the storage device “Garbage Data”. When a file is deleted in Windows or any OS, the file still exists on the storage device, be it an HDD or SSD. All Flash–based storage devices, SSDs included, are unique in the way they deal with previously deleted data.
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