Unused Reserve NAND Blocks

Na nekaj mesecev starem Crucial MX500 (500 GB) SSDju mi parameter B4 Unused Reserve NAND Blocks pod Raw Values kaže "35", medtem ko kaže drugi Crucial MX100 (512 GB), star par let, pri istem parametru "4403". Bi bil to lahko problem ali gre samo za drugačno tehnologijo?

Ne vem, kolikšna je bila vrednost na začetku, pozoren sem postal šele zdaj, ko je po nekaj mesecih uporabe življenjska doba šla na 99% (pri drugem je še vedno na 100%), enako tudi Average Block-Erase Count.

Pri prvem je torej tako:

ID Cur Wor Thr RawValues(6) Attribute Name
01 100 100 __0 000000000000 Raw Read Error Rate
05 100 100 _10 000000000000 Reallocated NAND Blocks
09 100 100 __0 0000000000CF Power On Hours
0C 100 100 __0 0000000000AA Power Cycle Count
AB 100 100 __0 000000000000 Program Fail Count
AC 100 100 __0 000000000000 Erase Fail Count
AD _99 _99 __0 000000000010 Average Block-Erase Count
AE 100 100 __0 000000000000 Unexpected Power Loss Count
B4 __0 __0 __0 000000000023 Unused Reserve NAND Blocks
B7 100 100 __0 000000000000 SATA Interface Downshift
B8 100 100 __0 000000000000 Error Correction Count
BB 100 100 __0 000000000000 Reported Uncorrectable Errors
C2 _41 _31 __0 00450000003B Temperature
C4 100 100 __0 000000000000 Reallocation Event Count
C5 100 100 __0 000000000000 Current Pending Sector Count
C6 100 100 __0 000000000000 Smart Off-line Scan Uncorrectable Error Count
C7 100 100 __0 000000000000 Ultra DMA CRC Error Rate
CA _99 _99 __1 000000000001 Percent Lifetime Used
CE 100 100 __0 000000000000 Write Error Rate
D2 100 100 __0 000000000000 Successful RAIN Recovery Count
F6 100 100 __0 00010F605BBE Total Host Sector Writes
F7 100 100 __0 000004A0CC97 Host Program Page Count
F8 100 100 __0 00000451B126 Background Program Page Count

Pri nekaj let starem pa:

ID Cur Wor Thr RawValues(6) Attribute Name
01 100 100 __0 000000000000 Raw Read Error Rate
05 100 100 __0 000000000000 Reallocated NAND Blocks
09 100 100 __0 00000000025D Power On Hours
0C 100 100 __0 0000000007BD Power Cycle Count
AB 100 100 __0 000000000000 Program Fail Count
AC 100 100 __0 000000000000 Erase Fail Count
AD 100 100 __0 00000000001B Average Block-Erase Count
AE 100 100 __0 00000000001F Unexpected Power Loss Count
B4 __0 __0 __0 000000001133 Unused Reserve NAND Blocks
B7 100 100 __0 000000000000 SATA Interface Downshift
B8 100 100 __0 000000000000 Error Correction Count
BB 100 100 __0 000000000000 Reported Uncorrectable Errors
C2 _72 _43 __0 0039000D001C Temperature
C4 100 100 __0 000000000000 Reallocation Event Count
C5 100 100 __0 000000000000 Current Pending Sector Count
C6 100 100 __0 000000000000 Smart Off-line Scan Uncorrectable Error Count
C7 100 100 __0 000000000000 Ultra DMA CRC Error Rate
CA 100 100 __0 000000000000 Percent Lifetime Used
CE 100 100 __0 000000000000 Write Error Rate
D2 100 100 __0 000000000000 Successful RAIN Recovery Count
F6 100 100 __0 0002E9669476 Total Host Sector Writes
F7 100 100 __0 0000175993E8 Host Program Page Count
F8 100 100 __0 00001E4262BB Background Program Page Count

OK, ampak meni na prvi pogled deluje, kot da ima novi zelo malo rezerve, sploh v primerjavi s par let starim.

CyberPunk je 23. dec 2018 ob 11:07 izjavil:

OK, ampak meni na prvi pogled deluje, kot da ima novi zelo malo rezerve, sploh v primerjavi s par let starim.

Raw S.M.A.R.T. vrednosti v vecini primerov ne mores direktno interpretirati, niti je v vecini primerov ne mores neposredno primerjati med dvema diskoma, ki sploh nista iz iste proizvodne serije, niti ne istega modela.