I have Adata su650 480GB SSD which is generally working fine. Recent check of SMART values using CrystalDiskInfo reports 257 bad block count. Now I need to know a few things with respect to this parameter
- What is this bad block count and is it early or later bad blocks?
- Does it mean 257 blocks are bad?
- Are they excluded from I/O after being reported?
- Sometimes when copying a single large file, the speed drops to just 2 – 3 MB/s for a few seconds and then again jumps to 200 MB/s. Is this because of bad blocks?
- There’s no visible data loss as of now. Nothing seems to have gone corrupted
- Do I have a bad SSD?
Thank you all for informative answers.
Response to comments –
I have double checked with Adata SSD Toolbox but the parameters like Reallocated Sector etc are not reported. Maybe they are missing in the hardware itself.
I downloaded Adata’s SSD Toolbox app and it reports these parameters as Vendor Specified. See the attached screenshot:
AA Vendor Specified 72 72 10 Raw Value 101 Hex
That’s puzzling. Does it mean CrystalDiskInfo is interpreting the data and reporting it differently? Is that Bad Block Count really Bad Block Count? I would trust Adata’s tool as they know what they have designed?
I tried submitting online query to Adata Support online but the web form errors out in the end
This question may appear to be a duplicate of Bad block count (early - later)?, but here I do not have early or later separation of data, so this is not an exact duplicate as such, and I have a larger scope.