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In other words, SSDs do not use any physically indexable locations, and software cannot specifically target sectors on the disk. Changes made for wear leveling record to a separate file map. While the SSD uses a file system to communicate data storage locations to the host system, it also re-shuffles the data to ensure even wear across all memory blocks. Each write process causes the memory to degrade or "wear." Instead of writing to a location on a physical disc, an SSD writes the data to a block. Whereas a solid-state drive is a form of flash memory, like a USB thumb drive-but with a much larger capacity. The operating system indexes the file locations in a file system and accesses the data using a mechanical arm. Wear leveling is one of the major differences between a regular magnetic hard drive and a solid-state drive.Ī traditional hard drive stores files in physical locations on a magnetic platter. The first protection comes in the form of wear leveling, designed to evenly distribute stored data between SSD blocks to ensure even wear. HDD: Which Storage Device Should You Choose? What Is SSD Wear Levelling?
Sandisk secure erase ssd series#
SSDs are designed with self-sufficiency in mind, using a series of algorithms and fail-safes that the manufacturer puts in place to maximize drive life and ensure data is discarded correctly. Generally speaking, you should never have to perform any maintenance on your solid-state drive.
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So, how do you securely erase an SSD without damaging the drive? Using a regular tool can damage the SSD, reducing its lifespan. Like other types of flash memory, you can only write to an SSD so many times, which presents an issue if you want to wipe the solid-state drive clean. An SSD was once a trade-off between disk space, cost, and the speed boost, but large capacity SSDs are now cheaper than ever. The "minimum unit" of it is 256 blocks.A solid-state drive (SSD) is one of the best upgrades you can make to your PC. I've also seen drives from SanDisk that its "head" and "tail" cannot be wiped with TRIM command in any form. (There are still leftover at the end since 65535 * 2 = 131070 is not a multiple of 8, but you can see that 131064 blocks are continuously wiped.) See the difference of my Intel 530 ( sda) and Silicon Power S70 ( sdb):Īnd the difference when the ranges are not aligned and aligned: This can be checked with something like hexdump after the TRIM. of block in a single range) - 65535 % 8), assuming the starting offset is 0 (or a multiple of ), otherwise there will be leftover blocks that will not be wiped. So when I want to wipe it clean with blkdiscard or hdparm, I will need to make sure that no "minimum unit" is "covered" by two TRIM ranges. However, be aware that TRIM implementation in some of the disks has a "requirement" in the TRIM commands issued, so only when it is fulfilled, all the blocks on the drive will then "read zero" after TRIM.įor example, the Intel 530 SSD requires the TRIM block ranges to be "aligned" to 8 blocks. You can use blkdiscard to wipe a whole block device (disk/partition) including the GPT and superblock and whatsoever. On the other hand, fstrim is not the only way to TRIM a device. So after all ATA Secure Erase in SSDs is not really THAT secure, unless yours support "hardware encryption". Except those with "hardware encryption", where ATA Enhanced Secure Erase is basically a regeneration of the encryption key.
Sandisk secure erase ssd full#
The truth is, in most, if not all, SSDs, ATA Secure Erase is an equivalence to a full device TRIM.