Bad eraseblock on RT-AC68U

[phayze]

Does anyone knows what is bad eraseblock? My friend RT-AC68U dun have this message. I have just change a new set. Used to have only one bad eraseblock, now got two (more) bad eraseblock.

Below is an extract from the log.

Jan 1 08:00:10 kernel: Bad eraseblock 288 at 0x000002400000
Jan 1 08:00:10 kernel: Bad eraseblock 594 at 0x000004a40000
Jan 1 08:00:10 kernel: Options: NO_AUTOINCR,NO_READRDY,BBT_SCAN2NDPAGE,

 

[liangtam]

Means the Flash memory that store the firmware/config might have area(s) that is un-read/writable.
Typically, a small amount would be present after manufacturing.

Or it could just be a fluke and not show up at a later time.

 

[phayze]

Asus@SG can advice?

 

[ASUS@SG]

Able to hard reset? and flash latest frimware?

 

[phayze]

Yes. Can flash new firmware and hard reset. Still same.

Able to hard reset? and flash latest frimware?

 

[ASUS@SG]

Yes. Can flash new firmware and hard reset. Still same.

Kindly bring down your router to avertek

call them to check available stock before go down.. very limited stock.

Avertek Enterprises Pte Ltd

95 Kallang Avenue #03-00
AIS Industrial Building Singapore 339420
Tel: (65) 6341 7839 Fax: (65) 63417739

Operating Hours

9.30am - 6.00 pm ( Mondays – Friday)

Closed on Saturday, Sundays and Public Holidays

 

[phayze]

Change once at harvey norman.

And yesterday went to avertek, their sets also same problem.

Kindly bring down your router to avertek

call them to check available stock before go down.. very limited stock.

Avertek Enterprises Pte Ltd

95 Kallang Avenue #03-00
AIS Industrial Building Singapore 339420
Tel: (65) 6341 7839 Fax: (65) 63417739

Operating Hours

9.30am - 6.00 pm ( Mondays – Friday)

Closed on Saturday, Sundays and Public Holidays

 

[ASUS@SG]

Change once at harvey norman.

And yesterday went to avertek, their sets also same problem.

Dear phayze,

Let me check and get back to you asap

 

[phayze]

Thanks a lot.

Dear phayze,

Let me check and get back to you asap

 

[4ndychan]

A bad batch of asus rt-ac68u?

 

[phayze]

I guess so. My fren RT-AC68U dun have this problem.

A bad batch of asus rt-ac68u?

 

[4ndychan]

I guess so. My fren RT-AC68U dun have this problem.

How is the ac68u performance? Would you recommend it to people despite your current experience? Considering to upgrade from ac 66u but tomato firmware just got supported on ac66u and has got a guide on upgrading to it by one of the forumer's website.

 

[phayze]

I have RT-AC66U. Feature wise is same. AC68U Range seems slightly better than AC66U. Wireless performance almost same (+/-2MB/s).

Both USB3 and USB2 read speed on AC68U is around 27MB/s for a USB3 thumbdrive that is capable of 100MB/s read speed; No different for USB2 and USB3.

And VPN performance for AC68U (60mbps)is almost double of AC66U(30mbps).

This is what I see so far.

How is the ac68u performance? Would you recommend it to people despite your current experience? Considering to upgrade from ac 66u but tomato firmware just got supported on ac66u and has got a guide on upgrading to it by one of the forumer's website.

 

[ASUS@SG]

A bad batch of asus rt-ac68u?

Nope, don't worry.

For RT-AC68U and RT-AC56U, we use NAND flash.

If the router can boot-up(power on) normally, this information is common and fine.

So don't need to compare another same model has this error.

Flash has different type, we use SPI(Serial) and NAND flash for our product.

You can read the wiki about flash as below:
Flash memory - Wikipedia, the free encyclopedia

NAND flash in write/read data’s speed is faster than SPI, and NAND flash’s size is much bigger than SPI,
So NAND flash compare with SPI, NAND flash has a lot of advantage.

 

[phayze]

I understand. Its like harddisk for bad sector still can use without any problem. U just mark the sector as bad and can continue to use.

But I dun think I can accept this if this defect is known. Either dun show this info or have to get it fix.

I guess nobody will be happy to know if their SSD show bad sector even though they can still use.

Nope, don't worry.

For RT-AC68U and RT-AC56U, we use NAND flash.

If the router can boot-up(power on) normally, this information is common and fine.

So don't need to compare another same model has this error.

Flash has different type, we use SPI(Serial) and NAND flash for our product.

You can read the wiki about flash as below:
Flash memory - Wikipedia, the free encyclopedia

NAND flash in write/read data’s speed is faster than SPI, and NAND flash’s size is much bigger than SPI,
So NAND flash compare with SPI, NAND flash has a lot of advantage.

 

[ASUS@SG]

I understand. Its like harddisk for bad sector still can use without any problem. U just mark the sector as bad and can continue to use.

But I dun think I can accept this if this defect is known. Either dun show this info or have to get it fix.

I guess nobody will be happy to know if their SSD show bad sector even though they can still use.

Dear Phayze,

1st: NAND technology architecture design to be like this, no matter what kind of vendor used this NAND chip will have same error and it's up to vendor they want to hide the error code.

2nd: NAND not using same technology as SSD or hard disk technology.

 

[phayze]

I got another RT-AC68U which dun have this error.

Dear Phayze,

1st: NAND technology architecture design to be like this, no matter what kind of vendor used this NAND chip will have same error and it's up to vendor they want to hide the error code.

2nd: NAND not using same technology as SSD or hard disk technology.

 

[ASUS@SG]

I got another RT-AC68U which dun have this error.

Dear Phayze,

Sooner will have same error code, it's very common.

I can request help you hide the error code if you want.

Do you remember how RD ram and SD ram? how it work?

 

[phayze]

Lol. Never mind. I just leave it.

If sooner or later will have error, I think the asus should not use such lousy NAND. I dun expect that more bad block will appear so fast.

Dear Phayze,

Sooner will have same error code, it's very common.

I can request help you hide the error code if you want.

Do you remember how RD ram and SD ram? how it work?

 

[ASUS@SG]

Lol. Never mind. I just leave it.

If sooner or later will have error, I think the asus should not use such lousy NAND. I dun expect that more bad block will appear so fast.

NAND isn't lousy...... it's one of the fastest and stable compare to others.

You should really need to understand the technology their bad block not so called bad sector.