Inzersdorfer
Software-Overclocker(in)
Information: Externe USB-HDD mit SMR nutzten UNMAP = TRIM
Bei externen USB-HDD mit SMR (Shingled Magnetic Recording) wird die USB Variante UNMAP von TRIM genutzt, das führt dazu das bei einer Schnellformatierung oder Datenlöschung KEINE Daten wiederhergestellt werden können! Der Translator zeigt Recoveryprogrammen und auch Hexeditoren in solchen Fällen nur 00 an, obwohl die Daten physisch noch auf der HDD vorhanden sind, auch professionelle Datenretter scheitern daran.
Siehe auch:
TRIM Command Support for WD External Drives
Answer ID 25185
WD external SSD drives and WD external HDD drives that have SMR (Shingled Magnetic Recording) drive inside, offer TRIM command support which is enabled by default in Windows 7 and above, designed to maintain the performance of SSD or HDD at an optimal level over the lifetime of the drive. The TRIM command enables an OS (Operating System) to inform an SSD or HDD which blocks of data are no longer considered to be in use and can be reclaimed internally by the SSD or HDD to ensure that later write operations perform at full speed.
TRIM command support on the USB (SCSI) side is called UNMAP and the controller performs an UNMAP to TRIM translation. It maintains the performance at an optimal level (as fresh out of the box) over its lifetime and reduces the wear and tear of the drive, as it reclaims the occupied garbage space in advanced, avoiding unnecessary read-modify-write operations.
TRIM/UNMAP is supported for external hard drives with SMR (Shingled Magnetic Recording) drive inside, like SSDs, for dataset management and to improve SMR performance over time. One of the shingled write benefits is that all physical sectors are written sequentially in a direction radially and are only rewritten after a wrap-around. Rewriting a previously written LBA (Logical Block Addressing) will cause the previous write to be marked invalid and the LBA will be written to the next sequential physical sector. The TRIM/UNMAP enables the OS to inform the drive which blocks are no longer considered to be in use and can be reclaimed internally by the HDD to ensure that later write operations perform at full speed.
Published 12/21/2018 | Updated 04/25/2019
TRIM Command Support for WD External Drives
Bei externen USB-HDD mit SMR (Shingled Magnetic Recording) wird die USB Variante UNMAP von TRIM genutzt, das führt dazu das bei einer Schnellformatierung oder Datenlöschung KEINE Daten wiederhergestellt werden können! Der Translator zeigt Recoveryprogrammen und auch Hexeditoren in solchen Fällen nur 00 an, obwohl die Daten physisch noch auf der HDD vorhanden sind, auch professionelle Datenretter scheitern daran.
Siehe auch:
TRIM Command Support for WD External Drives
Answer ID 25185
WD external SSD drives and WD external HDD drives that have SMR (Shingled Magnetic Recording) drive inside, offer TRIM command support which is enabled by default in Windows 7 and above, designed to maintain the performance of SSD or HDD at an optimal level over the lifetime of the drive. The TRIM command enables an OS (Operating System) to inform an SSD or HDD which blocks of data are no longer considered to be in use and can be reclaimed internally by the SSD or HDD to ensure that later write operations perform at full speed.
TRIM command support on the USB (SCSI) side is called UNMAP and the controller performs an UNMAP to TRIM translation. It maintains the performance at an optimal level (as fresh out of the box) over its lifetime and reduces the wear and tear of the drive, as it reclaims the occupied garbage space in advanced, avoiding unnecessary read-modify-write operations.
TRIM/UNMAP is supported for external hard drives with SMR (Shingled Magnetic Recording) drive inside, like SSDs, for dataset management and to improve SMR performance over time. One of the shingled write benefits is that all physical sectors are written sequentially in a direction radially and are only rewritten after a wrap-around. Rewriting a previously written LBA (Logical Block Addressing) will cause the previous write to be marked invalid and the LBA will be written to the next sequential physical sector. The TRIM/UNMAP enables the OS to inform the drive which blocks are no longer considered to be in use and can be reclaimed internally by the HDD to ensure that later write operations perform at full speed.
Published 12/21/2018 | Updated 04/25/2019
TRIM Command Support for WD External Drives