Re: H.d.d Low Level Format

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Cinty Bolner

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Jul 15, 2024, 1:52:49 PM7/15/24

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HDD Low Level Format Tool is a tool for securely formatting and removing data from storage drives. When you delete a file from your computer, that file can easily be recovered, since it is not actually deleted from the memory. Instead, what Windows does is it allows the bits occupied by that file on your hard disk, SSD or USB stick to be overwritten.

h.d.d low level format

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Therefore, HDD Low Level Format Tool overwrites all the bits in a storage unit and assigns them a value of "00". This is very useful if you want to avoid leaving any trace of your personal information on a storage device. This is ideal when you want to, for example, sell a hard drive on a second-hand website, as it makes it impossible to recover the stored information.

It is important not to abuse this tool with SSD or USB flash drives, as it will generate a full write cycle of the drive size, and decrease its useful life. These drives have a limited number of write cycles, so be sure to use it only once. The performance of the program varies depending on the speed of your storage drive, working faster on an SSD and slower on a hard disk.

By opening HDD Low Level Format Tool, you can see the full list of your available storage drives. After choosing the one you want, click on "Next" and you will have three options: View device details, View S.M.A.R.T. data to view information such as the number of write cycles or hours of use, and the Low-level formatting option. When you select the "Format this device" option, you should be aware that any data stored on it will be erased forever, and cannot be recovered even with programs such as Recuva. When it reaches 100%, the process is complete.

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Therefore, HDD Low Level Format Tool overwrites all the bits in a storage unit and assigns them a value of \"00\". This is very useful if you want to avoid leaving any trace of your personal information on a storage device. This is ideal when you want to, for example, sell a hard drive on a second-hand website, as it makes it impossible to recover the stored information.

By opening HDD Low Level Format Tool, you can see the full list of your available storage drives. After choosing the one you want, click on \"Next\" and you will have three options: View device details, View S.M.A.R.T. data to view information such as the number of write cycles or hours of use, and the Low-level formatting option. When you select the \"Format this device\" option, you should be aware that any data stored on it will be erased forever, and cannot be recovered even with programs such as Recuva. When it reaches 100%, the process is complete.

Actually the term "low level" is a bit of a misnomer. The low-level process first used years ago in MFM hard drives bears little resemblance to what we now call a "low-level format" for today's SATA and ATA (IDE) drives. The only safe method of initializing all the data on a Seagate device is the zero fill erase option in SeaTools for DOS. This is a simple process of writing all zeros (0's) to the entire hard disk drive.

By design, modern disc drives maintain spare sectors for reallocation purposes. Usually, sectors become difficult to read long before they become impossible to read. In this situation the actual data bytes in the sector are preserved and transferred to the new spare during a sector reallocation. Similarly, when a disc drive writes data (like a zero fill erase procedure) and encounters a problem, the drive firmware retires the problem sector and activates a replacement before giving successful write status.

SeaTools for DOS can be downloaded from the SeaTools homepage. It includes three Erase (Zero Fill) options. Zero Fill writes zeros in each data sector for the complete capacity of the drive and cleans up most defects.

The download routine for SeaTools for DOS creates a bootable CD or floppy diskette. Boot from the CD media or diskette to start SeaTools for DOS. After startup, it is a good idea to test your drive. The Basic Short Test takes less than a minute to complete. The Basic Long Test can take several hours to complete, depending on the capacity of the drive. When you are ready to erase the drive, select the drive you want to erase. Then select one of the three zero fill Erase functions.

Erase Track ZERO: Erases just the first 63 sectors on the drive which takes less than a second to complete. This procedure removes the Master Boot Record (MBR) and Partition Table. This will cause the drive to look "empty" to a new installation of the operating system.

Timed Erase: Erases sectors for various time limits up to 5 minutes. These options will overwrite the sectors at the beginning of the drive where the majority of the static operating system files reside.

Full Erase: Erases every data sector on the drive and takes a long time to complete. This procedure can easily take several hours to complete. The advantage of this option is to discover and reallocate any defective (hard to read) sectors to good spares. This option comes closest in concept to the original idea of a low level format.

This freeware HDD Low Level Format utility can erase, Low-Level Format and re-certify a SATA, IDE, SAS, SCSI, SSD hard disk drive. Will also work with any USB and FIREWIRE external drive enclosures as well as SD, MMC, MemoryStick and CompactFlash...

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Yup, and IIRC some of the proprietary bootable diagnostics tools (SeaTools, Maxtor PowerMax are the ones that come to mind) could run routines in the drive firmware back in the old days, but that was before even SATA existed.

Secure erase overwrites all user data areas with binary zeroes. Enhanced secure erase writes predetermined data patterns (set by the manufacturer) to all user data areas, including sectors that are no longer in use due to reallocation.

If you can describe the ATA bus commands being issued over SATA that are initiating a low-level format then I would love to be proven wrong. The linux hdparm llformat is just a poorly named secure erase implementation.

Under unixoid systems you can do it with "hdparm". You need to get "root" first, then do the following. This is assuming that the drive you want to low-level format is "/dev/sda" and that you have "hdparm" installed.

The parameter is a capital "i", not a lowercase "l", just in case the font is ambiguous. If the drive shows "frozen" you must first "un-freeze" it. What you need to do to "un-freeze" it depends on the device. Most devices will "un-freeze" if you put the system to "suspend to RAM" mode, then wake it up again. If the device shows "not frozen", you can proceed.

It should now display "enabled" under "Security:". This is quite a critical step. The device is now secured. If you power it down, it will lock and might become inaccessible. When you perform the low-level format NOW, security will be disabled again and you can continue using the device.

Please note that Low-Level formatting a hard drive refers to something completely different and should never be done by an end user. Also note that the notion of formatting a drive comes from the old DOS days. In Unix/Linux creating file systems and partition tables is more common and precise.

Supplemental:There is also the possibility of keeping the partition table and just erasing the boot loader code in the MBR, but you should make a backup first and then try zeroing the boot loader code:

Note that some boot loaders utilize the space between the MBR and the first partition to safe additional data. This is likely not to cause issues in this case, but if you want to do a complete boot loader backup, you should be aware of this.

Please note that this will not effectively overwrite all data on the disk, despite the warning. It will remove the partition table and data will not be accessible easily, but data will still be recoverable by an expert.

A Low Level Format (LLF) means redefining physical disk layout. This is not doable by user on today's HDDs and SSDs. One usually want's to perform LLF to securely erase all data, reallocate bad sectors and/or remove malware.